slip: remove dead code within the slip initialization

This following code contains a dead "if (dev).." block:
        ...
        for (i = 0; i < slip_maxdev; i++) {
                dev = slip_devs[i];
                if (dev == NULL)
                        break;
        }
        /* Sorry, too many, all slots in use */
        if (i >= slip_maxdev)
                return NULL;

        if (dev) {
                sl = netdev_priv(dev);
                if (test_bit(SLF_INUSE, &sl->flags)) {
                        unregister_netdevice(dev);
                        dev = NULL;
                        slip_devs[i] = NULL;
                }
         }
        ...
The reason is that the code starting with "if (dev).." is never called as
when we found an empty slot (dev == NULL) we break the loop and "if (dev).."
not works eiter the loop ends and we get out with "i >= slip_maxdev".

Signed-off-by: Matvejchikov Ilya <matvejchikov@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/slip.c

@@ -723,6 +723,7 @@ static void sl_sync(void)
 static struct slip *sl_alloc(dev_t line)
 {
 	int i;
+	char name[IFNAMSIZ];
 	struct net_device *dev = NULL;
 	struct slip       *sl;
 
@@ -735,25 +736,12 @@ static struct slip *sl_alloc(dev_t line)
 	if (i >= slip_maxdev)
 		return NULL;
 
-	if (dev) {
-		sl = netdev_priv(dev);
-		if (test_bit(SLF_INUSE, &sl->flags)) {
-			unregister_netdevice(dev);
-			dev = NULL;
-			slip_devs[i] = NULL;
-		}
-	}
-
-	if (!dev) {
-		char name[IFNAMSIZ];
-		sprintf(name, "sl%d", i);
-
-		dev = alloc_netdev(sizeof(*sl), name, sl_setup);
-		if (!dev)
-			return NULL;
-		dev->base_addr  = i;
-	}
+	sprintf(name, "sl%d", i);
+	dev = alloc_netdev(sizeof(*sl), name, sl_setup);
+	if (!dev)
+		return NULL;
 
+	dev->base_addr  = i;
 	sl = netdev_priv(dev);
 
 	/* Initialize channel control data */