avformat/usmdec: do not return 0 when no packet was produced
Fixes: Assertion pkt->stream_index < (unsigned)s->nb_streams && "Invalid stream index.\n" failed at libavformat/demux.c:617 Fixes: 62498/clusterfuzz-testcase-minimized-ffmpeg_dem_USM_fuzzer-4734740995112960 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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