Merge commit '95fd52c11bff1aad93a29aed3bd5472bd2981d1f'

* commit '95fd52c11bff1aad93a29aed3bd5472bd2981d1f':
  mxfdec: set extradata size

Conflicts:
	libavformat/mxfdec.c

no change as ffmpeg was not affected by this bug

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