Merge remote-tracking branch 'qatar/master'

* qatar/master:
  lavf utils: Remove write-only variable
  lavf utils: Rename shadowing variable
  smacker: fix a few off by 1 errors
  Check for invalid VLC value in smacker decoder.
  Check and propagate errors when VLC trees cannot be built in smacker decoder.

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

diff --cc libavformat/utils.c
Simple merge