Fixed base_path variable based on the last git-p4 description comment (s...

Fixed base_path variable based on the last git-p4 description comment. Check at: 
git-p4:1166  = https://github.com/dtrott/git-p4/blob/836fe0a4dbe5f21cf1f53c2b3005be585e9bb945/git-p4#L1166