avcodec/alacdsp: fix integer overflow in decorrelate_stereo()
Fixes: signed integer overflow: -16777216 * 131 cannot be represented in type 'int' Fixes: 23835/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_ALAC_fuzzer-5669943160078336 Fixes: 41101/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_ALAC_fuzzer-4636330705944576 Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpegSigned-off-by:Michael Niedermayer <michael@niedermayer.cc>
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