Merge commit '3735b5c616770429572f86aabdaec39c6ebb8818'
* commit '3735b5c616770429572f86aabdaec39c6ebb8818':
Revert "lavfi: always check av_expr_parse_and_eval() return value"
See: 8c9a23833d
Merged-by: Michael Niedermayer <michaelni@gmx.at>
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