Fixup for sys_lwcond_signal_x error checking

[elad335]

in sys_lwcond_signal:

• Check for EPERM in mode 2 if a specific ppu thread id was specified.
• Move ENOENT check of mode 3 to unspecific ppu thread id handling.
• If the ppu thread id target does not belong to a thread, return ESRCH.

both:

• Mode 2 doesnt use the lwmutex, therefore ESRCH check for lwmutex id doesnt occur.

testcase, results:

master:

lwcond_signal(null id, mode 1) returned 0x80010009
lwcond_signal(main_thread, mode 2) returned 0x0
lwcond_signal(-1 id, mode 2) returned 0x0
lwcond_signal(main_thread, mode 3) returned 0x80010006
lwcond_signal(-1 id, mode 3) returned 0x80010009
lwcond_signal_all(invalid mtx, mode 2) returned 0x80010005

realhw:

lwcond_signal(null id, mode 1) returned 0x80010005
lwcond_signal(main_thread, mode 2) returned 0x80010009
lwcond_signal(-1 id, mode 2) returned 0x0
lwcond_signal(main_thread, mode 3) returned 0x80010009
lwcond_signal(-1 id, mode 3) returned 0x80010006
lwcond_signal_all(invalid mtx, mode 2) returned 0x0

[elad335]

I've changed a few things in sys_mutex_unlock, I need testers to confirm that Demon's souls 4c4t issue is still solved.

[psennermann]

For me DeS seems to work fine (i5 7400)

[Dani1977]

Hi,
i have i7-7700K this is my log for DeS, work ok

RPCS3.log.gz

Regards