o Code simplification and refactoring:
    - We remove the return value of node_get_prim_orport() and
      node_get_prim_dirport(), and introduce node_get_prim_orport()
      in node_ipv6_or_preferred() and node_ipv6_dir_preferred() in
      order to check for a null address. Closes ticket 23873. Patch
      by Neel Chauhan.