[FFmpeg-cvslog] Merge commit '42ba1c51d9e843135772a3b9e5cf036a37b28bdb'

[Michael Niedermayer]

ffmpeg | branch: master | Michael Niedermayer <michaelni at gmx.at> | Thu Apr  3 21:07:24 2014 +0200| [d9ac00ca7a8cabd8d19e580a42d9129b8831fa52] | committer: Michael Niedermayer

Merge commit '42ba1c51d9e843135772a3b9e5cf036a37b28bdb'

* commit '42ba1c51d9e843135772a3b9e5cf036a37b28bdb':
  log: Document AV_LOG_C usage

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

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=d9ac00ca7a8cabd8d19e580a42d9129b8831fa52
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