OSV-2020-425 Heap-buffer-overflow in ihevcd_parse_coding_unit

OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=17055 Crash type: Heap-buffer-overflow READ 1 Crash state: ihevcdparsecodingunit ihevcdparsecodingquadtree ihevcdparsecodingquadtree...