OSV-2021-504 Heap-buffer-overflow in ih264d_mark_err_slice_skip

OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=31757 Crash type: Heap-buffer-overflow WRITE 8 Crash state: ih264dmarkerrsliceskip ih264dvideodecode ih264dapifunction...