Merge commit 'bb823e26b1cbb91b475c10772cdfd867d4809a65' into release/2.4
* commit 'bb823e26b1cbb91b475c10772cdfd867d4809a65':
avformat: Make avformat_free_context handle NULL
See: ee23dcf534
Merged-by: Michael Niedermayer <michaelni@gmx.at>
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