tunnels: harmonize cleanup done on skb on xmit path

The goal of this patch is to harmonize cleanup done on a skbuff on xmit path.
Before this patch, behaviors were different depending of the tunnel type.

Signed-off-by: Nicolas Dichtel <nicolas.dichtel@6wind.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/ipv6/ip6_tunnel.c b/net/ipv6/ip6_tunnel.c
index 72372ac..ecbcdbd 100644
--- a/net/ipv6/ip6_tunnel.c
+++ b/net/ipv6/ip6_tunnel.c
@@ -1001,8 +1001,7 @@
 		goto tx_err_dst_release;
 	}
 
-	if (!net_eq(t->net, dev_net(dev)))
-		skb_scrub_packet(skb, true);
+	skb_scrub_packet(skb, !net_eq(t->net, dev_net(dev)));
 
 	/*
 	 * Okay, now see if we can stuff it in the buffer as-is.
@@ -1021,7 +1020,6 @@
 		consume_skb(skb);
 		skb = new_skb;
 	}
-	skb_dst_drop(skb);
 	if (fl6->flowi6_mark) {
 		skb_dst_set(skb, dst);
 		ndst = NULL;