Revert yet another blame behavior change towards kidney blame.
Revert yet another blame behavior change towards kidney blame.

* subversion/libsvn_client/blame.c
  (svn_client_blame5): An 'extra revision' is not needed for backwards
    blame, as the revision itself 'is the last change'.


git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@1661236 13f79535-47bb-0310-9956-ffa450edef68

YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion