[Cocoa] Potential channel count mismatch in CARingBuffer FetchABL
<rdar://problem/100412139>
Pull request: https://github.com/WebKit/WebKit/pull/5711
Committed 255924@main (013ff9c5d616): <https://commits.webkit.org/255924@main> Reviewed commits have been landed. Closing PR #5711 and removing active labels.