[NET]: drop duplicate assignment in request_sock

Just noticed that request_sock.[ch] contain a useless assignment of
rskq_accept_head to itself.  I assume this is a typo and the 2nd one
was supposed to be _tail.  However, setting _tail to NULL is not
needed, so the patch below just drops the 2nd assignment.
Signed-off-By: Norbert Kiesel <nkiesel@tbdnetworks.com>
Signed-off-by: Adrian Bunk <bunk@stusta.de>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/net/request_sock.h

@@ -145,7 +145,7 @@ static inline struct request_sock *
 {
 	struct request_sock *req = queue->rskq_accept_head;
 
-	queue->rskq_accept_head = queue->rskq_accept_head = NULL;
+	queue->rskq_accept_head = NULL;
 	return req;
 }
 

net/core/request_sock.c

@@ -51,7 +51,7 @@ int reqsk_queue_alloc(struct request_sock_queue *queue,
 
 	get_random_bytes(&lopt->hash_rnd, sizeof(lopt->hash_rnd));
 	rwlock_init(&queue->syn_wait_lock);
-	queue->rskq_accept_head = queue->rskq_accept_head = NULL;
+	queue->rskq_accept_head = NULL;
 	lopt->nr_table_entries = nr_table_entries;
 
 	write_lock_bh(&queue->syn_wait_lock);