This merges commit 4fded048 from libav,
originally written by Anton Khirnov and skipped in
fc63d5ce.

 libavcodec/h264_slice.c | 20 +++++++++++++-------
 libavcodec/h264dec.c    |  3 +++
 libavcodec/h264dec.h    |  5 +++++
 3 files changed, 21 insertions(+), 7 deletions(-)