avcodec/jpegxl_parser: Check get_vlc2()
Fixes: shift exponent -1 is negative Fixes: 63889/clusterfuzz-testcase-minimized-ffmpeg_DEMUXER_fuzzer-6009343056936960 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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