hevc_mvs: initialize the temporal MV in case of missing ref

The caller expects the MV to always be initialized.
hevc_mvs: make sure to always initialize the temporal MV fully

The spec requires this.

Fixes uninitialized reads on some samples.

Remove now unnecessary initialization of the whole merge candidate list.
h263dec: Force padding bug workaround for H.263.

Fixes decoding of http://samples.mplayerhq.hu/V-codecs/h263/h263-raw/messenger.h263

Signed-off-by: Anton Khirnov <anton@khirnov.net>
Merge commit '79a60c8e779242b5ba4c531b2c706c871e8e6420'

* commit '79a60c8e779242b5ba4c531b2c706c871e8e6420':
  hevc_mvs: initialize the temporal MV in case of missing ref

Merged-by: Michael Niedermayer <michaelni@gmx.at>
Merge commit 'd208d1eba3799c58fd6d3602d31de3e686f14aec'

* commit 'd208d1eba3799c58fd6d3602d31de3e686f14aec':
  hevc_mvs: make sure to always initialize the temporal MV fully

Conflicts:
	libavcodec/hevc_mvs.c

Merged-by: Michael Niedermayer <michaelni@gmx.at>
Merge commit '9a03c2323593173a201cb75edd1b49887cf811ed'

* commit '9a03c2323593173a201cb75edd1b49887cf811ed':
  h263dec: Force padding bug workaround for H.263.

This is not merged as it breaks a good part of the error concealment/resilience for H.263
Also, messenger.h263 plays fine in ffmpeg.
If anyone has any other h263 files that do not work, please open an issue on trak or
mail me!

See: d225b0f7aaa65eafccc87165130e1c4bab71708b
Merged-by: Michael Niedermayer <michaelni@gmx.at>
avfilter/af_adelay: use av_freep(), do not leave stale pointers in memory

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
avformat/tiertexseq: use av_freep(), do not leave stale pointers in memory

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