[FFmpeg-soc] [soc] Limit ff_find_unused_picture to only part of s->picture.

[Alexander Strange]

 Otherwise, a thread may call delayed_release_buffer and then later allocate a picture in the same place, reusing the other Picture variables while they're still in use.
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 libavcodec/mpegvideo.c |   12 ++++++++----
 libavcodec/mpegvideo.h |    3 +++
 2 files changed, 11 insertions(+), 4 deletions(-)
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