Memory errors when trying to decode invalid bitstream

[frankplow]

Trying to decode this invalid bitstream: 000324.bit can cause modify-after-free errors or segmentation faults. The bitstream caused issues for the FFmpeg VVC decoder because it has multiple SPSs with different values of sps_chroma_format_idc (it goes from greyscale to 4:2:0 IIRC). It is a fuzzed bitstream with many strange features however, and so this may be a red herring.