Follow up to r23757: fix a test failure in get_path_ancestor_length on posix  platforms.
Follow up to r23757: fix a test failure in get_path_ancestor_length on posix 
platforms.

* subversion/libsvn_subr/path.c
  (get_path_ancestor_length): small change in the order of how the path cases
   are handled.


git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@863835 13f79535-47bb-0310-9956-ffa450edef68

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