avcodec/vc1_block: Fix integer overflow in ac value
Fixes: signed integer overflow: 25488 * 87381 cannot be represented in type 'int' Fixes: 24765/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_VC1_fuzzer-5108259565076480 Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpegSigned-off-by: NMichael Niedermayer <michael@niedermayer.cc>
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