Clarity fix.
Clarity fix.

* subversion/libsvn_client/merge.c
  (do_directory_merge):  'svn_path_get_longest_ancestor' returns
  'empty char *' when unrelated paths are involved, so make use of it rather
  than explicit call to 'svn_path_is_child'.

Suggested by: cmpilato


git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@874830 13f79535-47bb-0310-9956-ffa450edef68

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