avcodec/mpc: Fix multiple numerical overflows in ff_mpc_dequantize_and_synth()
Fixes: -2.4187e+09 is outside the range of representable values of type 'int' Fixes: signed integer overflow: -14512205 + -2147483648 cannot be represented in type 'int' Fixes: 20492/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_MPC7_fuzzer-5747263166480384 Fixes: 23528/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_MPC7_fuzzer-5747263166480384 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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