tipc: Minor optimizations to name table translation code

Optimizes TIPC's name table translation code to avoid unnecessary
manipulation of the node address field of the resulting port id when
name translation fails.  This change is possible because a valid port
id cannot have a reference field of zero, so examining the reference
only is sufficient to determine if the translation was successful.

Signed-off-by: Allan Stephens <allan.stephens@windriver.com>
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/tipc/name_table.c

@@ -613,8 +613,7 @@ struct publication *tipc_nametbl_remove_publ(u32 type, u32 lower,
 }
 
 /*
- * tipc_nametbl_translate(): Translate tipc_name -> tipc_portid.
- *                      Very time-critical.
+ * tipc_nametbl_translate - translate name to port id
  *
  * Note: on entry 'destnode' is the search domain used during translation;
  *       on exit it passes back the node address of the matching port (if any)
@@ -685,7 +684,6 @@ found:
 	}
 	spin_unlock_bh(&seq->lock);
 not_found:
-	*destnode = 0;
 	read_unlock_bh(&tipc_nametbl_lock);
 	return 0;
 }

net/tipc/port.c

@@ -1464,7 +1464,7 @@ int tipc_forward2name(u32 ref,
 	msg_set_destnode(msg, destnode);
 	msg_set_destport(msg, destport);
 
-	if (likely(destport || destnode)) {
+	if (likely(destport)) {
 		p_ptr->sent++;
 		if (likely(destnode == tipc_own_addr))
 			return tipc_port_recv_sections(p_ptr, num_sect, msg_sect);
@@ -1542,7 +1542,7 @@ int tipc_forward_buf2name(u32 ref,
 	skb_push(buf, LONG_H_SIZE);
 	skb_copy_to_linear_data(buf, msg, LONG_H_SIZE);
 	msg_dbg(buf_msg(buf),"PREP:");
-	if (likely(destport || destnode)) {
+	if (likely(destport)) {
 		p_ptr->sent++;
 		if (destnode == tipc_own_addr)
 			return tipc_port_recv_msg(buf);