avcodec/alacdsp: Make intermediates unsigned
Fixes: signed integer overflow: -14914387 + -2147418648 cannot be represented in type 'int' Fixes: 46464/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_ALAC_fuzzer-474307197311385 Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg Signed-off-by:Michael Niedermayer <michael@niedermayer.cc> (cherry picked from commit 8709f4c1) Signed-off-by:
Michael Niedermayer <michael@niedermayer.cc>
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