[BOX32][WRAPPER] Fixed null checking in my32_SDL_SetVideoMode #4141

Job	Run time
build (X64, Release, ubuntu-latest)	1m 40s
build (X64, Trace, ubuntu-latest)	1m 48s
build (X64, Box32, ubuntu-latest)	1m 39s
build (RISCV, Release, ubuntu-latest)	5m 41s
build (RISCV, Trace, ubuntu-latest)	6m 1s
build (RISCV, StaticBuild, ubuntu-latest)	3m 58s
build (RISCV, Box32, ubuntu-latest)	5m 58s
build (RK3588, Release, ubuntu-latest)	5m 25s
build (RK3588, Trace, ubuntu-latest)	5m 28s
build (RK3588, StaticBuild, ubuntu-latest)	3m 44s
build (RK3588, Box32, ubuntu-latest)	5m 20s
build (ARM64, Release, ubuntu-latest)	5m 22s
build (ARM64, Trace, ubuntu-latest)	5m 33s
build (ARM64, StaticBuild, ubuntu-latest)	4m 1s
build (ARM64, Box32, ubuntu-latest)	5m 38s
build (ANDROID, Release, ubuntu-latest)	2m 8s
build (ANDROID, Trace, ubuntu-latest)	2m 27s
build (TERMUX, Release, ubuntu-latest)	2m 5s
build (TERMUX, Trace, ubuntu-latest)	2m 21s
build (LARCH64, Release, ubuntu-latest)	3m 28s
build (LARCH64, Trace, ubuntu-latest)	3m 51s
build (LARCH64, StaticBuild, ubuntu-latest)	1m 58s
build (LARCH64, Box32, ubuntu-latest)	3m 34s
	1h 29m 8s

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