Follow-up to r26229, small optimization.
Follow-up to r26229, small optimization.

* subversion/libsvn_client/merge.c
  (do_merge): Don't bother checking if non-inheritable ranges need to be
  made inheritable if target has no mergeinfo to start with.


git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@866356 13f79535-47bb-0310-9956-ffa450edef68

wbond/subversion,wbond/subversion,YueLinHo/Subversion,YueLinHo/Subversion,wbond/subversion,wbond/subversion,wbond/subversion,wbond/subversion,wbond/subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion