Follow-up to r1595277: Restore logic that got accidentally removed during conflict resolution.
Follow-up to r1595277:
Restore logic that got accidentally removed during conflict resolution.

* subversion/libsvn_fs_x/tree.c
  (compare_dir_structure): Re-introduce shortcut condition. This ensures
                           that the following iteration is valid on both
                           arrays.

git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@1682714 13f79535-47bb-0310-9956-ffa450edef68

YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion