avcodec/dpcm: clip exponent into supported range in XAN DPCM
Fixes: shift exponent 32 is too large for 32-bit type 'int' Fixes: 21200/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_XAN_DPCM_fuzzer-5754704894361600 Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpegReviewed-by:Anton Khirnov <anton@khirnov.net> Signed-off-by:
Michael Niedermayer <michael@niedermayer.cc>
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