* commit '70196673':
  vmd: drop incomplete chunks and spurious samples

Conflicts:
	libavcodec/vmdav.c

2 of the changes are replaced by assert0s, as they should
be impossible.
The actual bug is likely caused by a invalid block_align
which is checked for and thus impossible in ffmpeg.
Merged-by: Michael Niedermayer <michaelni@gmx.at>