[FFmpeg-soc] [soc] Don't run the last part of decode_update_context() when the last frame was dropped.

[Alexander Strange]

This fixes mplayer -framedrop crashing. Of course, they're still run in some cases when it wouldn't be without threads, but those are all error conditions.
---
 libavcodec/h264.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
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