[Cocoa] ImageDecoderAVFObjC::storeSampleBuffer can leak a CGImage
<rdar://problem/114411564>
Pull request: https://github.com/WebKit/WebKit/pull/17042
Committed 267259@main (34880c26a151): <https://commits.webkit.org/267259@main> Reviewed commits have been landed. Closing PR #17042 and removing active labels.