OSV-2020-548 Heap-buffer-overflow in acommon::DecodeDirect<unsigned short>::decode

OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=16531 Crash type: Heap-buffer-overflow READ 2 Crash state: acommon::DecodeDirect::decode acommon::Convert::convert aspellspellersuggest...