[WAN]: kfree of NULL pointer is valid

kfree(0) is perfectly valid, checking pointers for NULL before calling 
kfree() on them is redundant. The patch below cleans away a few such 
redundant checks (and while I was around some of those bits I couldn't 
stop myself from making a few tiny whitespace changes as well).

Signed-off-by: Jesper Juhl <juhl-lkml@dif.dk>
Acked-by: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/wan/x25_asy.c

@@ -107,13 +107,9 @@ static struct x25_asy *x25_asy_alloc(void)
 static void x25_asy_free(struct x25_asy *sl)
 {
 	/* Free all X.25 frame buffers. */
-	if (sl->rbuff)  {
-		kfree(sl->rbuff);
-	}
+	kfree(sl->rbuff);
 	sl->rbuff = NULL;
-	if (sl->xbuff)  {
-		kfree(sl->xbuff);
-	}
+	kfree(sl->xbuff);
 	sl->xbuff = NULL;
 
 	if (!test_and_clear_bit(SLF_INUSE, &sl->flags)) {
@@ -134,10 +130,8 @@ static int x25_asy_change_mtu(struct net_device *dev, int newmtu)
 	{
 		printk("%s: unable to grow X.25 buffers, MTU change cancelled.\n",
 		       dev->name);
-		if (xbuff != NULL)  
-			kfree(xbuff);
-		if (rbuff != NULL)  
-			kfree(rbuff);
+		kfree(xbuff);
+		kfree(rbuff);
 		return -ENOMEM;
 	}
 
@@ -169,10 +163,8 @@ static int x25_asy_change_mtu(struct net_device *dev, int newmtu)
 
 	spin_unlock_bh(&sl->lock);
 
-	if (xbuff != NULL) 
-		kfree(xbuff);
-	if (rbuff != NULL)
-		kfree(rbuff);
+	kfree(xbuff);
+	kfree(rbuff);
 	return 0;
 }