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Fixes out of array accesses
Fixes: ffmpeg_012v_crash.ts
Found-by: Thomas Lindroth <thomas.lindroth@gmail.com>
Reviewed-by: Thomas Lindroth <thomas.lindroth@gmail.com>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
(cherry picked from commit 48df30d3)

Conflicts:

	libavcodec/012v.c