Check nullity of CGColorSpaceCopyICCProfile's return value
Check nullity of CGColorSpaceCopyICCProfile's return value

Happens when the window is minimized or during the laps of time it
goes to fullscreen, the CGImage size being 1x1.

Issue introduced when adding ICC profile support, see
https://webrtc-review.googlesource.com/c/src/+/133580

Bug: chromium:945468
Change-Id: I65e90eaaa8999578f6127c229376ead219d7a795
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/133708
Reviewed-by: Sergey Ulanov <8a30473e5cf3b93eac32943832fa7a9609291d70@chromium.org>
Commit-Queue: Julien Isorce <177997fc8166815df6f85d30d1378a7a2fd73bfe@chromium.org>
Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#27832}

TimothyGu/libilbc,ShiftMediaProject/libilbc,ShiftMediaProject/libilbc,ShiftMediaProject/libilbc,TimothyGu/libilbc,ShiftMediaProject/libilbc,ShiftMediaProject/libilbc,TimothyGu/libilbc,TimothyGu/libilbc,TimothyGu/libilbc