Remove unnecessary variable in merge.c: 
Remove unnecessary variable in merge.c: 

* subversion/libsvn_client/merge.c
  (drive_merge_report_editor): Remove default_start, it's always revision1.



git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@872716 13f79535-47bb-0310-9956-ffa450edef68

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