Commit 0fe6abf: SDL_PollEvent(NULL) in video.c causes crash on macOS

[littlejackal]

System:

• macOS 14.6.1 (23G93), M1 Pro (Apple Silicon)
• sdl2: stable 2.30.7 (from homebrew)
• sdl2_image: stable 2.8.2 (from homebrew)

Issue:

vt100 binary compiles as expected, however crashes immediately at startup after briefly rendering the SDL window:

❯ ls
Makefile   ddt.c      keyboard.c nvr.c      render.c   sound.c    term.h     vt100      vt100.h
cpu.c      icon.jpg   main.c     pusart.c   rom.c      sys.c      video.c    vt100.dSYM
❯ ./vt100
*** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'nextEventMatchingMask should only be called from the Main Thread!'
*** First throw call stack:
(
	0   CoreFoundation                      0x000000018832e2ec __exceptionPreprocess + 176
	1   libobjc.A.dylib                     0x0000000187e12158 objc_exception_throw + 60
	2   AppKit                              0x000000018c30de2c -[NSApplication(NSEventRouting) _nextEventMatchingEventMask:untilDate:inMode:dequeue:] + 3096
	3   libSDL2-2.0.0.dylib                 0x0000000101190c14 Cocoa_PumpEventsUntilDate + 84
	4   libSDL2-2.0.0.dylib                 0x0000000101190dc4 Cocoa_PumpEvents + 56
	5   libSDL2-2.0.0.dylib                 0x0000000101108100 SDL_PumpEventsInternal + 64
	6   libSDL2-2.0.0.dylib                 0x0000000101108218 SDL_WaitEventTimeout_REAL + 88
	7   vt100                               0x0000000100aec02c refresh + 92
	8   vt100                               0x0000000100aeddd8 events + 52
	9   vt100                               0x0000000100ae73b8 cputhread + 64
	10  libSDL2-2.0.0.dylib                 0x000000010114875c SDL_RunThread + 48
	11  libSDL2-2.0.0.dylib                 0x00000001011a14d4 RunThread + 12
	12  libsystem_pthread.dylib             0x00000001881d9f94 _pthread_start + 136
	13  libsystem_pthread.dylib             0x00000001881d4d34 thread_start + 8
)
libc++abi: terminating due to uncaught exception of type NSException
[1]    60547 abort      ./vt100

If I comment out the following code, vt100 compiles as expected, and runs as expected with no crash:

161   if (SDL_PollEvent(NULL))
162     return;

Uncertain as to implication of commenting out this code, but it seems related to recent commit 0fe6abf.