[FFmpeg-cvslog] Merge remote-tracking branch 'qatar/release/9' into release/1.1

[Michael Niedermayer]

ffmpeg | branch: release/1.1 | Michael Niedermayer <michaelni at gmx.at> | Wed Aug 28 13:29:23 2013 +0200| [7fe88bc66c8d1a03a1a64a2bf9984bc173b203f1] | committer: Michael Niedermayer

Merge remote-tracking branch 'qatar/release/9' into release/1.1

* qatar/release/9:
  ac3: Return proper error codes
  ac3: Clean up the error paths
  ac3: Do not clash with normal AVERROR

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

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=7fe88bc66c8d1a03a1a64a2bf9984bc173b203f1
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