raw: move buffer size check up.

This way, it protects against overreads for 4bpp/2bpp content also.

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
CC: libav-stable@libav.org
pull/3/merge
Ronald S. Bultje 13 years ago
parent f1320dc3be
commit cc5dd632ce
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