Fix various memory leaks

[Pokechu22]

I fixed a few memory leaks I found with valgrind. Note that I tested on Dolphin running in WSL, which is a very jank setup. There are still a few errors reported, but I'm guessing they're related to the setup instead.

New valgrind output

$ valgrind --leak-check=full --track-origins=yes --show-leak-kinds=definite,indirect,possible Binaries/dolphin-emu
==27794== Memcheck, a memory error detector
==27794== Copyright (C) 2002-2017, and GNU GPL'd, by Julian Seward et al.
==27794== Using Valgrind-3.15.0 and LibVEX; rerun with -h for copyright info
==27794== Command: Binaries/dolphin-emu
==27794==
==27794== error calling PR_SET_PTRACER, vgdb might block
QStandardPaths: XDG_RUNTIME_DIR not set, defaulting to '/tmp/runtime-pokechu22'
==27807== Warning: invalid file descriptor 1024 in syscall close()
==27807== Warning: invalid file descriptor 1025 in syscall close()
==27807== Warning: invalid file descriptor 1026 in syscall close()
==27807== Warning: invalid file descriptor 1027 in syscall close()
==27807==    Use --log-fd=<number> to select an alternative log fd.
==27807== Warning: invalid file descriptor 1028 in syscall close()
==27807== Warning: invalid file descriptor 1029 in syscall close()
==27794== Syscall param writev(vector[...]) points to uninitialised byte(s)
==27794==    at 0xA8E34BD: __writev (writev.c:26)
==27794==    by 0xA8E34BD: writev (writev.c:24)
==27794==    by 0xAAD1EC8: ??? (in /usr/lib/x86_64-linux-gnu/libxcb.so.1.1.0)
==27794==    by 0xAAD2328: ??? (in /usr/lib/x86_64-linux-gnu/libxcb.so.1.1.0)
==27794==    by 0xAAD25B6: ??? (in /usr/lib/x86_64-linux-gnu/libxcb.so.1.1.0)
==27794==    by 0xAAD2E1F: xcb_flush (in /usr/lib/x86_64-linux-gnu/libxcb.so.1.1.0)
==27794==    by 0xE234857: ??? (in /usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5.12.8)
==27794==    by 0x534AC07: QWindowPrivate::applyCursor() (in /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5.12.8)
==27794==    by 0x534E7CA: QWindowPrivate::setCursor(QCursor const*) (in /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5.12.8)
==27794==    by 0x49F320A: ??? (in /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5.12.8)
==27794==    by 0x49FD05F: QWidget::setCursor(QCursor const&) (in /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5.12.8)
==27794==    by 0x47D393: RenderWidget::HandleCursorTimer() (RenderWidget.cpp:191)
==27794==    by 0x5ABC327: QMetaObject::activate(QObject*, int, int, void**) (in /usr/lib/x86_64-linux-gnu/libQt5Core.so.5.12.8)
==27794==  Address 0xdcab72e is 4,590 bytes inside a block of size 21,168 alloc'd
==27794==    at 0x483DD99: calloc (in /usr/lib/x86_64-linux-gnu/valgrind/vgpreload_memcheck-amd64-linux.so)
==27794==    by 0xAAD1884: xcb_connect_to_fd (in /usr/lib/x86_64-linux-gnu/libxcb.so.1.1.0)
==27794==    by 0xAAD5A2D: xcb_connect_to_display_with_auth_info (in /usr/lib/x86_64-linux-gnu/libxcb.so.1.1.0)
==27794==    by 0x511DD29: _XConnectXCB (in /usr/lib/x86_64-linux-gnu/libX11.so.6.3.0)
==27794==    by 0x510E3A8: XOpenDisplay (in /usr/lib/x86_64-linux-gnu/libX11.so.6.3.0)
==27794==    by 0xE23EBFF: QXcbBasicConnection::QXcbBasicConnection(char const*) (in /usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5.12.8)
==27794==    by 0xE210321: QXcbConnection::QXcbConnection(QXcbNativeInterface*, bool, unsigned int, char const*) (in /usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5.12.8)
==27794==    by 0xE215069: QXcbIntegration::QXcbIntegration(QStringList const&, int&, char**) (in /usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5.12.8)
==27794==    by 0xE1AF512: ??? (in /usr/lib/x86_64-linux-gnu/qt5/plugins/platforms/libqxcb.so)
==27794==    by 0x532CFC2: QPlatformIntegrationFactory::create(QString const&, QStringList const&, int&, char**, QString const&) (in /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5.12.8)
==27794==    by 0x533AFA0: QGuiApplicationPrivate::createPlatformIntegration() (in /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5.12.8)
==27794==    by 0x533C707: QGuiApplicationPrivate::createEventDispatcher() (in /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5.12.8)
==27794==  Uninitialised value was created by a heap allocation
==27794==    at 0x483B7F3: malloc (in /usr/lib/x86_64-linux-gnu/valgrind/vgpreload_memcheck-amd64-linux.so)
==27794==    by 0xE46D4E0: xcb_image_create (in /usr/lib/x86_64-linux-gnu/libxcb-image.so.0.0.0)
==27794==    by 0xE46E40E: xcb_image_native (in /usr/lib/x86_64-linux-gnu/libxcb-image.so.0.0.0)
==27794==    by 0xE46E655: xcb_create_pixmap_from_bitmap_data (in /usr/lib/x86_64-linux-gnu/libxcb-image.so.0.0.0)
==27794==    by 0xE233F5F: ??? (in /usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5.12.8)
==27794==    by 0xE234312: ??? (in /usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5.12.8)
==27794==    by 0xE23492A: ??? (in /usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5.12.8)
==27794==    by 0x534AC07: QWindowPrivate::applyCursor() (in /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5.12.8)
==27794==    by 0x534E7CA: QWindowPrivate::setCursor(QCursor const*) (in /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5.12.8)
==27794==    by 0x49F320A: ??? (in /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5.12.8)
==27794==    by 0x49FD05F: QWidget::setCursor(QCursor const&) (in /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5.12.8)
==27794==    by 0x47D393: RenderWidget::HandleCursorTimer() (RenderWidget.cpp:191)
==27794==
==27794==
==27794== HEAP SUMMARY:
==27794==     in use at exit: 628,810 bytes in 10,187 blocks
==27794==   total heap usage: 1,979,345 allocs, 1,969,158 frees, 945,324,785 bytes allocated
==27794==
==27794== 32 bytes in 1 blocks are indirectly lost in loss record 777 of 4,062
==27794==    at 0x483DD99: calloc (in /usr/lib/x86_64-linux-gnu/valgrind/vgpreload_memcheck-amd64-linux.so)
==27794==    by 0xE37A93C: ??? (in /usr/lib/x86_64-linux-gnu/libfontconfig.so.1.12.0)
==27794==    by 0xE37BFDC: ??? (in /usr/lib/x86_64-linux-gnu/libfontconfig.so.1.12.0)
==27794==    by 0xE38306C: ??? (in /usr/lib/x86_64-linux-gnu/libfontconfig.so.1.12.0)
==27794==    by 0xE761A59: ??? (in /usr/lib/x86_64-linux-gnu/libexpat.so.1.6.11)
==27794==    by 0xE76272F: ??? (in /usr/lib/x86_64-linux-gnu/libexpat.so.1.6.11)
==27794==    by 0xE75FB85: ??? (in /usr/lib/x86_64-linux-gnu/libexpat.so.1.6.11)
==27794==    by 0xE7610CD: ??? (in /usr/lib/x86_64-linux-gnu/libexpat.so.1.6.11)
==27794==    by 0xE764E7F: XML_ParseBuffer (in /usr/lib/x86_64-linux-gnu/libexpat.so.1.6.11)
==27794==    by 0xE380F42: ??? (in /usr/lib/x86_64-linux-gnu/libfontconfig.so.1.12.0)
==27794==    by 0xE38137B: ??? (in /usr/lib/x86_64-linux-gnu/libfontconfig.so.1.12.0)
==27794==    by 0xE38158C: ??? (in /usr/lib/x86_64-linux-gnu/libfontconfig.so.1.12.0)
==27794==
==27794== 64 bytes in 1 blocks are definitely lost in loss record 3,605 of 4,062
==27794==    at 0x483BE63: operator new(unsigned long) (in /usr/lib/x86_64-linux-gnu/valgrind/vgpreload_memcheck-amd64-linux.so)
==27794==    by 0x118380CD: ???
==27794==    by 0x10FC9063: ???
==27794==    by 0x4011B99: call_init.part.0 (dl-init.c:72)
==27794==    by 0x4011CA0: call_init (dl-init.c:30)
==27794==    by 0x4011CA0: _dl_init (dl-init.c:119)
==27794==    by 0xA92F984: _dl_catch_exception (dl-error-skeleton.c:182)
==27794==    by 0x401643C: dl_open_worker (dl-open.c:758)
==27794==    by 0xA92F927: _dl_catch_exception (dl-error-skeleton.c:208)
==27794==    by 0x4015609: _dl_open (dl-open.c:837)
==27794==    by 0x5DC934B: dlopen_doit (dlopen.c:66)
==27794==    by 0xA92F927: _dl_catch_exception (dl-error-skeleton.c:208)
==27794==    by 0xA92F9F2: _dl_catch_error (dl-error-skeleton.c:227)
==27794==
==27794== 288 (256 direct, 32 indirect) bytes in 1 blocks are definitely lost in loss record 3,937 of 4,062
==27794==    at 0x483B7F3: malloc (in /usr/lib/x86_64-linux-gnu/valgrind/vgpreload_memcheck-amd64-linux.so)
==27794==    by 0xE37A2F4: ??? (in /usr/lib/x86_64-linux-gnu/libfontconfig.so.1.12.0)
==27794==    by 0xE37A9B8: ??? (in /usr/lib/x86_64-linux-gnu/libfontconfig.so.1.12.0)
==27794==    by 0xE37BFDC: ??? (in /usr/lib/x86_64-linux-gnu/libfontconfig.so.1.12.0)
==27794==    by 0xE38306C: ??? (in /usr/lib/x86_64-linux-gnu/libfontconfig.so.1.12.0)
==27794==    by 0xE761A59: ??? (in /usr/lib/x86_64-linux-gnu/libexpat.so.1.6.11)
==27794==    by 0xE76272F: ??? (in /usr/lib/x86_64-linux-gnu/libexpat.so.1.6.11)
==27794==    by 0xE75FB85: ??? (in /usr/lib/x86_64-linux-gnu/libexpat.so.1.6.11)
==27794==    by 0xE7610CD: ??? (in /usr/lib/x86_64-linux-gnu/libexpat.so.1.6.11)
==27794==    by 0xE764E7F: XML_ParseBuffer (in /usr/lib/x86_64-linux-gnu/libexpat.so.1.6.11)
==27794==    by 0xE380F42: ??? (in /usr/lib/x86_64-linux-gnu/libfontconfig.so.1.12.0)
==27794==    by 0xE38137B: ??? (in /usr/lib/x86_64-linux-gnu/libfontconfig.so.1.12.0)
==27794==
==27794== LEAK SUMMARY:
==27794==    definitely lost: 320 bytes in 2 blocks
==27794==    indirectly lost: 32 bytes in 1 blocks
==27794==      possibly lost: 0 bytes in 0 blocks
==27794==    still reachable: 628,458 bytes in 10,184 blocks
==27794==         suppressed: 0 bytes in 0 blocks
==27794== Reachable blocks (those to which a pointer was found) are not shown.
==27794== To see them, rerun with: --leak-check=full --show-leak-kinds=all
==27794==
==27794== For lists of detected and suppressed errors, rerun with: -s
==27794== ERROR SUMMARY: 3 errors from 3 contexts (suppressed: 0 from 0)

(Those are the errors with both audio and graphics backends set to none; additional errors appear from external code when using other values, but I don't have audio actually working in WSL and the video part is a self-compiled very jank thing. Someone with an actual linux setup may want to do further testing.)