msrle: Use FFABS to determine the frame size in msrle_decode_pal4

As done in msrle_decode_8_16_24_32.

Bug-Id: CVE-2015-3395
CC: libav-stable@libav.org
pull/116/merge
Luca Barbato 10 years ago
parent b2f0f37d24
commit 5ecabd3c54
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