ba31b72f462cd95609d13713fff42b1b000a56c7

It can be 0 or -1 for invalid files, which may result in invalid memory
access.
Reported-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
CC: libav-stable@libav.org
(cherry picked from commit b88f902125
)
Conflicts:
libavcodec/bmv.c
Libav README ------------ 1) Documentation ---------------- * Read the documentation in the doc/ directory. 2) Licensing ------------ * See the LICENSE file.
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