avcodec/adpcm: Fix integer overflow in intermediate in ADPCM_XMD
Fixes: runtime error: signed integer overflow: 2140143616 + 254665816 cannot be represented in type 'int' Fixes: 45982/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_ADPCM_XMD_fuzzer-6690181676924928 As a sideeffect this simplifies the equation, the high bits are different after this but only the low 16bits are stored and used in later steps. Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpegReviewed-by:Paul B Mahol <onemda@gmail.com> Signed-off-by:
Michael Niedermayer <michael@niedermayer.cc>
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