ip6_tunnel: dont drop packet but consume it

When we need to reallocate skb, we dont drop a packet.
Call consume_skb() to not confuse dropwatch.
Signed-off-by: NEric Dumazet <edumazet@google.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

net/ipv6/ip6_tunnel.c

@@ -954,7 +954,7 @@ static int ip6_tnl_xmit2(struct sk_buff *skb,
 
 		if (skb->sk)
 			skb_set_owner_w(new_skb, skb->sk);
-		kfree_skb(skb);
+		consume_skb(skb);
 		skb = new_skb;
 	}
 	skb_dst_drop(skb);