Re: [PATCH v2] staging: greybus: lights: avoid NULL deref

[Chaitanya Mishra]

Hi Greg,

Found by manual code review while walking the error paths in
Gb_lights_light_config(): channels_count is set before channels
allocation, but cleanup uses channels_count to iterate and dereference
light->channels. If kcalloc() fails, that becomes a NULL deref.

Fix is simply deferring channels_count publication until after the
allocation succeeds; v2 includes the requested comment.

Tested with:
  ./scripts/checkpatch.pl --strict -g HEAD
  ./scripts/checkpatch.pl outgoing/0001-staging-greybus-lights-avoid-NULL-deref.patch

I couldn't build-test locally on macOS due to missing <elf.h> for
kernel host tools.

Thanks,
Chaitanya