OSV-2020-942 Heap-buffer-overflow in ihevcd_mv_pred

OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=16894 Crash type: Heap-buffer-overflow READ 4 Crash state: ihevcdmvpred ihevcdgetmvctb ihevcdparseslicedata...