[TIPC]: Minor cleanup of message header code

This patch eliminates some unused or duplicate message header
symbols, and fixes up the comments and/or location of a few
other symbols.

Signed-off-by: Allan Stephens <allan.stephens@windriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/tipc/link.c b/net/tipc/link.c
index cefa998..a42f434 100644
--- a/net/tipc/link.c
+++ b/net/tipc/link.c
@@ -2832,15 +2832,15 @@
 void tipc_link_set_queue_limits(struct link *l_ptr, u32 window)
 {
 	/* Data messages from this node, inclusive FIRST_FRAGM */
-	l_ptr->queue_limit[DATA_LOW] = window;
-	l_ptr->queue_limit[DATA_MEDIUM] = (window / 3) * 4;
-	l_ptr->queue_limit[DATA_HIGH] = (window / 3) * 5;
-	l_ptr->queue_limit[DATA_CRITICAL] = (window / 3) * 6;
+	l_ptr->queue_limit[TIPC_LOW_IMPORTANCE] = window;
+	l_ptr->queue_limit[TIPC_MEDIUM_IMPORTANCE] = (window / 3) * 4;
+	l_ptr->queue_limit[TIPC_HIGH_IMPORTANCE] = (window / 3) * 5;
+	l_ptr->queue_limit[TIPC_CRITICAL_IMPORTANCE] = (window / 3) * 6;
 	/* Transiting data messages,inclusive FIRST_FRAGM */
-	l_ptr->queue_limit[DATA_LOW + 4] = 300;
-	l_ptr->queue_limit[DATA_MEDIUM + 4] = 600;
-	l_ptr->queue_limit[DATA_HIGH + 4] = 900;
-	l_ptr->queue_limit[DATA_CRITICAL + 4] = 1200;
+	l_ptr->queue_limit[TIPC_LOW_IMPORTANCE + 4] = 300;
+	l_ptr->queue_limit[TIPC_MEDIUM_IMPORTANCE + 4] = 600;
+	l_ptr->queue_limit[TIPC_HIGH_IMPORTANCE + 4] = 900;
+	l_ptr->queue_limit[TIPC_CRITICAL_IMPORTANCE + 4] = 1200;
 	l_ptr->queue_limit[CONN_MANAGER] = 1200;
 	l_ptr->queue_limit[ROUTE_DISTRIBUTOR] = 1200;
 	l_ptr->queue_limit[CHANGEOVER_PROTOCOL] = 2500;