avformat/matroskadec: Move AVBufferRef instead of copying, fix memleak
EBML binary elements are already made reference-counted when read;
so when populating the AVStream.attached_pic, one does not need to
allocate a new buffer for the data; instead the current code just
creates a new reference to the underlying AVBuffer. But this can be
improved even further: Just move the already existing reference.
This also fixes a memleak that happens upon error because
matroska_read_close has not been called in this scenario.
Signed-off-by:
Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
(cherry picked from commit cbe336c9e81e2d9de3a18abef887c9255a9b9da5)
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