ipv6: Eliminate dst_get_neighbour_noref() usage in ip6_forward().

It's only used to get at neigh->primary_key, which in this context is
always going to be the same as rt->rt6i_gateway.
Signed-off-by: David S. Miller <davem@davemloft.net>

net/ipv6/ip6_output.c

@@ -388,7 +388,6 @@ int ip6_forward(struct sk_buff *skb)
 	struct ipv6hdr *hdr = ipv6_hdr(skb);
 	struct inet6_skb_parm *opt = IP6CB(skb);
 	struct net *net = dev_net(dst->dev);
-	struct neighbour *n;
 	u32 mtu;
 
 	if (net->ipv6.devconf_all->forwarding == 0)
@@ -463,8 +462,7 @@ int ip6_forward(struct sk_buff *skb)
 	   send redirects to source routed frames.
 	   We don't send redirects to frames decapsulated from IPsec.
 	 */
-	n = dst_get_neighbour_noref(dst);
-	if (skb->dev == dst->dev && n && opt->srcrt == 0 && !skb_sec_path(skb)) {
+	if (skb->dev == dst->dev && opt->srcrt == 0 && !skb_sec_path(skb)) {
 		struct in6_addr *target = NULL;
 		struct rt6_info *rt;
 
@@ -474,8 +472,8 @@ int ip6_forward(struct sk_buff *skb)
 		 */
 
 		rt = (struct rt6_info *) dst;
-		if ((rt->rt6i_flags & RTF_GATEWAY))
-			target = (struct in6_addr*)&n->primary_key;
+		if (rt->rt6i_flags & RTF_GATEWAY)
+			target = &rt->rt6i_gateway;
 		else
 			target = &hdr->daddr;