[IP_TUNNEL]: Don't limit the number of tunnels with generic name explicitly.

Use the added dev_alloc_name() call to create tunnel device name,
rather than iterate in a hand-made loop with an artificial limit.

Thanks Patrick for noticing this.

[ The way this works is, when the device is actually registered,
  the generic code noticed the '%' in the name and invokes
  dev_alloc_name() to fully resolve the name.  -DaveM ]

Signed-off-by: Pavel Emelyanov <xemul@openvz.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/ipv6/ip6_tunnel.c

@@ -229,18 +229,11 @@ static struct ip6_tnl *ip6_tnl_create(struct ip6_tnl_parm *p)
 	char name[IFNAMSIZ];
 	int err;
 
-	if (p->name[0]) {
+	if (p->name[0])
 		strlcpy(name, p->name, IFNAMSIZ);
-	} else {
-		int i;
-		for (i = 1; i < IP6_TNL_MAX; i++) {
-			sprintf(name, "ip6tnl%d", i);
-			if (__dev_get_by_name(&init_net, name) == NULL)
-				break;
-		}
-		if (i == IP6_TNL_MAX)
-			goto failed;
-	}
+	else
+		sprintf(name, "ip6tnl%%d");
+
 	dev = alloc_netdev(sizeof (*t), name, ip6_tnl_dev_setup);
 	if (dev == NULL)
 		goto failed;