ip6_tunnel: Fix the type of functions

Functions ip6_tnl_change, ip6_tnl_update and ip6_tnl0_update do always
return 0, change the type of functions to void.
Signed-off-by: Hongbin Wang <wh_bin@126.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/ipv6/ip6_tunnel.c

@@ -1517,7 +1517,7 @@ static void ip6_tnl_link_config(struct ip6_tnl *t)
  *   ip6_tnl_change() updates the tunnel parameters
  **/
 
-static int
+static void
 ip6_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p)
 {
 	t->parms.laddr = p->laddr;
@@ -1531,29 +1531,25 @@ ip6_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p)
 	t->parms.fwmark = p->fwmark;
 	dst_cache_reset(&t->dst_cache);
 	ip6_tnl_link_config(t);
-	return 0;
 }
 
-static int ip6_tnl_update(struct ip6_tnl *t, struct __ip6_tnl_parm *p)
+static void ip6_tnl_update(struct ip6_tnl *t, struct __ip6_tnl_parm *p)
 {
 	struct net *net = t->net;
 	struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
-	int err;
 
 	ip6_tnl_unlink(ip6n, t);
 	synchronize_net();
-	err = ip6_tnl_change(t, p);
+	ip6_tnl_change(t, p);
 	ip6_tnl_link(ip6n, t);
 	netdev_state_change(t->dev);
-	return err;
 }
 
-static int ip6_tnl0_update(struct ip6_tnl *t, struct __ip6_tnl_parm *p)
+static void ip6_tnl0_update(struct ip6_tnl *t, struct __ip6_tnl_parm *p)
 {
 	/* for default tnl0 device allow to change only the proto */
 	t->parms.proto = p->proto;
 	netdev_state_change(t->dev);
-	return 0;
 }
 
 static void
@@ -1667,9 +1663,9 @@ ip6_tnl_siocdevprivate(struct net_device *dev, struct ifreq *ifr,
 			} else
 				t = netdev_priv(dev);
 			if (dev == ip6n->fb_tnl_dev)
-				err = ip6_tnl0_update(t, &p1);
+				ip6_tnl0_update(t, &p1);
 			else
-				err = ip6_tnl_update(t, &p1);
+				ip6_tnl_update(t, &p1);
 		}
 		if (!IS_ERR(t)) {
 			err = 0;
@@ -2091,7 +2087,8 @@ static int ip6_tnl_changelink(struct net_device *dev, struct nlattr *tb[],
 	} else
 		t = netdev_priv(dev);
 
-	return ip6_tnl_update(t, &p);
+	ip6_tnl_update(t, &p);
+	return 0;
 }
 
 static void ip6_tnl_dellink(struct net_device *dev, struct list_head *head)