hevc/rext: put a warning log message instead of an error log message

cherry picked from commit 243cb99cff727d6a14c32cdff2748f6c255dbaf4
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
hevc: fix transquant_bypass

cherry picked from commit 4a16cb2c70728a55d2fd723aff01b13ea259c4df
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
Merge remote-tracking branch 'ffmpeg-upstream/master' into ffmpeg_patch