Segfault when opening roms from the command line without a full path

[orbea]

OS: Slackware64-current
RetroArch-2017.01.04_7ec6dc0bd_master-x86_64-1_git
mame2010-libretro-2016.12.28_81c75bb_master-x86_64-1_git

mame2010-libretro will segfault if opening a rom from the command line without a full path.

Works:

• retroarch -L /usr/lib64/libretro/mame2010_libretro.so ./8ball.zip
• retroarch -L /usr/lib64/libretro/mame2010_libretro.so roms/8ball.zip
• Starting the game from the menu.

Segfault:

• retroarch -L /usr/lib64/libretro/mame2003_libretro.so 8ball.zip

Thread 1 "retroarch" received signal SIGSEGV, Segmentation fault.
0x00007fffe64c8f2e in running_machine::retro_loop (this=0x0) at src/emu/machine.c:444
444       if (!m_paused)
(gdb) bt
#0  0x00007fffe64c8f2e in running_machine::retro_loop (this=0x0) at src/emu/machine.c:444
#1  0x00007fffe64c6ea3 in retro_main_loop () at src/emu/mame.c:215
#2  0x00007fffe5d02b1a in retro_run () at src/osd/retro/retromapper.c:230
#3  0x00000000004127b6 in core_run () at core_impl.c:434
#4  0x0000000000426e70 in runloop_iterate (sleep_ms=0x7fffffffdfb0) at runloop.c:1186
#5  0x0000000000411337 in rarch_main (argc=4, argv=0x7fffffffe0c8, data=0x0)
    at frontend/frontend.c:130
#6  0x000000000041139e in main (argc=4, argv=0x7fffffffe0c8) at frontend/frontend.c:148

Full GDB log - http://pastebin.com/0RRPn0jg

This works in mame2000-libretro and mame2003-libretro suffers from a similar issue.
libretro/mame2003-libretro#74