OSV-2020-704 Heap-buffer-overflow in BEInt<unsigned char, 1>::set

OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=13736 Crash type: Heap-buffer-overflow WRITE 1 Crash state: BEInt::set CFF::CFFIndex ::setoffsetat bool CFF::FDArray ::serializeCFF::cff2fontdict...