[FFmpeg-cvslog] Merge commit '61c966ef30129a0e4dba485242c039a895914d33' into release/2.2

[Michael Niedermayer]

ffmpeg | branch: release/2.2 | Michael Niedermayer <michaelni at gmx.at> | Mon Mar  9 13:05:37 2015 +0100| [4b70e6e6e563e34b1e73431f40d4b1a4719d80a2] | committer: Michael Niedermayer

Merge commit '61c966ef30129a0e4dba485242c039a895914d33' into release/2.2

* commit '61c966ef30129a0e4dba485242c039a895914d33':
  webp: validate the distance prefix code

See: c089e720c1b753790c746a13053636d7facf6bf0
Merged-by: Michael Niedermayer <michaelni at gmx.at>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=4b70e6e6e563e34b1e73431f40d4b1a4719d80a2
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