OSV-2021-735 Use-of-uninitialized-value in decode_CABAC_FL_bypass

OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=34047 Crash type: Use-of-uninitialized-value Crash state: decodeCABACFLbypass decodecoeffabslevelremaining residualcoding...