avcodec/mjpegdec: quant_matrixes can be up to 65535, use uint16_t
Fixes invalid shift Fixes: 870/clusterfuzz-testcase-5649105424482304 Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/targets/ffmpegSigned-off-by: NMichael Niedermayer <michael@niedermayer.cc>
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