libavdevice/avfoundation.m: fix potential unreleased lock issue
The problem here is that the lock ctx->frame_lock will become an unreleased lock if the program returns at patched lines. Bug tracker link: https://trac.ffmpeg.org/ticket/9386\#ticketSigned-off-by:Chengfeng Ye <cyeaa@connect.ust.hk>
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