Fix a rac in FinishCommit.
Fix a rac in FinishCommit.

This is a bug that was exposed by CI on this branch. It doesn't actually
have to do with the segment integration.

ShengjieLuo/pachyderm,sambooo/pachyderm,ShengjieLuo/pachyderm,sambooo/pachyderm,sambooo/pachyderm,ShengjieLuo/pachyderm