[IPV6] IP6TUNNEL: Add missing nf_reset() on input path.

Signed-off-by: Yasuyuki Kozakai <yasuyuki.kozakai@toshiba.co.jp>
Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
diff --git a/net/ipv6/ip6_tunnel.c b/net/ipv6/ip6_tunnel.c
index c8d4160..b9f4029 100644
--- a/net/ipv6/ip6_tunnel.c
+++ b/net/ipv6/ip6_tunnel.c
@@ -542,6 +542,7 @@
 		skb->dev = t->dev;
 		dst_release(skb->dst);
 		skb->dst = NULL;
+		nf_reset(skb);
 		if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY)
 			ipv6_copy_dscp(ipv6h, skb->nh.ipv6h);
 		ip6ip6_ecn_decapsulate(ipv6h, skb);