svnmerge.py style change.
svnmerge.py style change.

* contrib/client-side/svnmerge.py
  (get_repo_root, action_avail, _find_common, CommandOpts.Cmd.Replace,
   main): Replace assertion conditionals which used 0 with the
   constant False (which is guaranteed present by some compat
   initialization code).


git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@859175 13f79535-47bb-0310-9956-ffa450edef68

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