avcodec/tiff: Check input space in dng_decode_jpeg()

Fixes: out of array read
Fixes: 24034/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_TIFF_fuzzer-5111884337119232

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg


Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit 79e8d170)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>