avcodec/smvjpegdec: check that frames_per_jpeg cleanly divides height
Fixes out of array access
If some valid files fail this check then please open a ticket and ping me and the smvjpegdec maintainer.
Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
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