Simplify print_dirs_changed_tree() and print_changed_tree() in svnlook.

* subversion/svnlook/svnlook.c
  (print_dirs_changed_tree, print_changed_tree): Use a svn_boolean_t for
    print_me, rename subpool to iterpool, remove duplicated code by
    restructuring some loops.
  (print_dirs_changed_tree)  remove the tmp_node->text_mod test which
    was redundent.
    


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1431591 13f79535-47bb-0310-9956-ffa450edef68