80c268eaaee402695a74d14acf76063100692a99

0 means no data consumed, so it can trigger an infinite loop in the
caller.
CC:libav-stable@libav.org
(cherry picked from commit c7d9b473e2
)
Signed-off-by: Anton Khirnov <anton@khirnov.net>
Conflicts:
libavcodec/cdgraphics.c
Libav README ------------ 1) Documentation ---------------- * Read the documentation in the doc/ directory. 2) Licensing ------------ * See the LICENSE file.
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