[FFmpeg-cvslog] Merge commit 'a0fa6d06b848f26b16ba12f0a9a4a85b93ab8022'

[Hendrik Leppkes]

ffmpeg | branch: master | Hendrik Leppkes <h.leppkes at gmail.com> | Mon Dec  7 14:51:23 2015 +0100| [0ecec7449c580dfb8b9f6f53dff413cec38e4982] | committer: Hendrik Leppkes

Merge commit 'a0fa6d06b848f26b16ba12f0a9a4a85b93ab8022'

* commit 'a0fa6d06b848f26b16ba12f0a9a4a85b93ab8022':
  matroska: Warn when metadata references a non-existent element

Merged-by: Hendrik Leppkes <h.leppkes at gmail.com>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=0ecec7449c580dfb8b9f6f53dff413cec38e4982
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