fate: use little endian yuv444p10 in h264-reinit tests

Fixes fate big endian configs.

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
buffersink/uninit: use av_frame_free() not unref

Fixes memleak

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
fate: dont try to filter partial frames with yadif.

The partial frames leak a few uninitialized pixels through
due to incomplete interlaced error concealment support.

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
yop: use reget_buffer() as the previous contents are used

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
avutil/buffer: support memory poisoning

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>