Fix Off-By-One Error in Counting DDS Search Attempts
Fix Off-By-One Error in Counting DDS Search Attempts

This caused us to double-search the first position and fail to search the
last position in the chain, slowing down search and making it less effective.

Cyan4973/zstd,Cyan4973/zstd,Cyan4973/zstd,Cyan4973/zstd,Cyan4973/zstd