[ATM]: fix sparse checker warnings (by Stephen Hemminger <shemminger@osdl.org>)

net/atm/br2684.c

@@ -558,7 +558,7 @@ Note: we do not have explicit unassign, but look at _push()
 	atmvcc->push = br2684_push;
 	skb_queue_head_init(&copy);
 	skb_migrate(&atmvcc->sk->sk_receive_queue, &copy);
-	while ((skb = skb_dequeue(&copy))) {
+	while ((skb = skb_dequeue(&copy)) != NULL) {
 		BRPRIV(skb->dev)->stats.rx_bytes -= skb->len;
 		BRPRIV(skb->dev)->stats.rx_packets--;
 		br2684_push(atmvcc, skb);

net/atm/clip.c

@@ -503,7 +503,7 @@ static int clip_mkip(struct atm_vcc *vcc,int timeout)
 	skb_queue_head_init(&copy);
 	skb_migrate(&vcc->sk->sk_receive_queue, &copy);
 	/* re-process everything received between connection setup and MKIP */
-	while ((skb = skb_dequeue(&copy)))
+	while ((skb = skb_dequeue(&copy)) != NULL)
 		if (!clip_devs) {
 			atm_return(vcc,skb->truesize);
 			kfree_skb(skb);

net/atm/common.c

@@ -187,7 +187,7 @@ static void vcc_destroy_socket(struct sock *sk)
 
 		vcc_remove_socket(sk);	/* no more receive */
 
-		while ((skb = skb_dequeue(&vcc->sk->sk_receive_queue))) {
+		while ((skb = skb_dequeue(&vcc->sk->sk_receive_queue)) != NULL) {
 			atm_return(vcc,skb->truesize);
 			kfree_skb(skb);
 		}

net/atm/lec.c

@@ -567,7 +567,7 @@ lec_atm_close(struct atm_vcc *vcc)
         if (skb_peek(&vcc->sk->sk_receive_queue))
 		printk("%s lec_atm_close: closing with messages pending\n",
                        dev->name);
-        while ((skb = skb_dequeue(&vcc->sk->sk_receive_queue))) {
+        while ((skb = skb_dequeue(&vcc->sk->sk_receive_queue)) != NULL) {
                 atm_return(vcc, skb->truesize);
 		dev_kfree_skb(skb);
         }
@@ -1940,7 +1940,7 @@ lec_arp_check_expire(unsigned long data)
                                            priv->path_switching_delay)) {
 			                        struct sk_buff *skb;
 
- 				                while ((skb = skb_dequeue(&entry->tx_wait)))
+ 				                while ((skb = skb_dequeue(&entry->tx_wait)) != NULL)
 					                lec_send(entry->vcc, skb, entry->priv);
                                                 entry->last_used = jiffies;
                                                 entry->status = 
@@ -2337,7 +2337,7 @@ lec_flush_complete(struct lec_priv *priv, unsigned long tran_id)
                             entry->status == ESI_FLUSH_PENDING) {
 			        struct sk_buff *skb;
 
- 				while ((skb = skb_dequeue(&entry->tx_wait)))
+ 				while ((skb = skb_dequeue(&entry->tx_wait)) != NULL)
 					lec_send(entry->vcc, skb, entry->priv);
                                 entry->status = ESI_FORWARD_DIRECT;
                                 DPRINTK("LEC_ARP: Flushed\n");

net/atm/svc.c

@@ -66,7 +66,7 @@ static void svc_disconnect(struct atm_vcc *vcc)
 	}
 	/* beware - socket is still in use by atmsigd until the last
 	   as_indicate has been answered */
-	while ((skb = skb_dequeue(&vcc->sk->sk_receive_queue))) {
+	while ((skb = skb_dequeue(&vcc->sk->sk_receive_queue)) != NULL) {
 		DPRINTK("LISTEN REL\n");
 		sigd_enq2(NULL,as_reject,vcc,NULL,NULL,&vcc->qos,0);
 		dev_kfree_skb(skb);