avformat/subtitles: Honour ff_subtitles_read_line() documentation
It claims to always zero-terminate its buffer like snprintf(), yet it does it not on EOF. Because of this the mcc demuxer used uninitialized values when reading an empty input file. Reviewed-by:Paul B Mahol <onemda@gmail.com> Signed-off-by:
Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
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