Don't silently ignore a "--new" argument to "svn diff" when "--old" is not given; error out instead.
Don't silently ignore a "--new" argument to "svn diff" when "--old" is not
given; error out instead.

* subversion/svn/diff-cmd.c
  (svn_cl__diff): Error out if "--new" is given without "--old".


git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@858841 13f79535-47bb-0310-9956-ffa450edef68

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