tipc: remove zeroing assignments to static global variables

Cleans up TIPC's source code to eliminate the needless initialization
of static variables to zero.

These changes are purely cosmetic and do not alter the operation of TIPC
in any way.

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>
diff --git a/net/tipc/port.c b/net/tipc/port.c
index 78fcb75..c23f338 100644
--- a/net/tipc/port.c
+++ b/net/tipc/port.c
@@ -46,8 +46,8 @@
 
 #define MAX_REJECT_SIZE 1024
 
-static struct sk_buff *msg_queue_head = NULL;
-static struct sk_buff *msg_queue_tail = NULL;
+static struct sk_buff *msg_queue_head;
+static struct sk_buff *msg_queue_tail;
 
 DEFINE_SPINLOCK(tipc_port_list_lock);
 static DEFINE_SPINLOCK(queue_lock);