Andreas Rheinhardt fd5726a226 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>
(cherry picked from commit 8766361fc1)

2022-01-11 15:15:53 +01:00

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