tipc: Ensure network address change doesn't impact configuration service

Enhances command validation done by TIPC's configuration service so
that it works properly even if the node's network address is changed in
mid-operation. The default node address of <0.0.0> is now recognized as an
alias for "this node" even after a new network address has been assigned.
Signed-off-by: NAllan Stephens <allan.stephens@windriver.com>
Signed-off-by: NPaul Gortmaker <paul.gortmaker@windriver.com>

net/tipc/config.c

@@ -290,7 +290,7 @@ struct sk_buff *tipc_cfg_do_cmd(u32 orig_node, u16 cmd, const void *request_area
 
 	/* Check command authorization */
 
-	if (likely(orig_node == tipc_own_addr)) {
+	if (likely(in_own_node(orig_node))) {
 		/* command is permitted */
 	} else if (cmd >= 0x8000) {
 		rep_tlv_buf = tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED