|   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.
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