error: add error code AVERROR_OPTION_NOT_FOUND, and use it in opt.c
The new error code is better than AVERROR(ENOENT), which has a completely different semantics ("No such file or directory"). Signed-off-by: NStefano Sabatini <stefano.sabatini-lala@poste.it> Signed-off-by: NAnton Khirnov <anton@khirnov.net>
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