Fixed zstd_opt encoding error with repeat-offsets
Fixed zstd_opt encoding error with repeat-offsets

Cyan4973/zstd,Majlen/zstd,Cyan4973/zstd,inikep/zstd,ds77/zstd,Majlen/zstd,inikep/zstd,inikep/zstd,Cyan4973/zstd,Cyan4973/zstd,Cyan4973/zstd,inikep/zstd,Majlen/zstd,Majlen/zstd,ds77/zstd,ds77/zstd,ds77/zstd