avcodec/utils: Align YUV411 by as much as the other YUV variants
Fixes out of array accesses Fixes: ffmpeg_mjpeg_crash2.avi Found-by:Thomas Lindroth <thomas.lindroth@gmail.com> Tested-by:
Thomas Lindroth <thomas.lindroth@gmail.com> Signed-off-by:
Michael Niedermayer <michaelni@gmx.at>
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