avformat/avidec: Fix memleak with embedded GAB2 subtitles
The code for GAB2 subtitles predates refcounting AVPackets. So in order
to transfer the ownership of a packet's data pkt->data was simply stored
and the packet zeroed; in the end (i.e. in the read_close-function) this
data was then simply freed with av_freep(). This of course leads to a leak
of an AVBufferRef and an AVBuffer. It has been fixed by keeping and
eventually unreferencing the packet's buf instead.
Additionally, the packet is now reset via av_packet_unref().
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
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