tunnels: harmonize cleanup done on skb on rx path

The goal of this patch is to harmonize cleanup done on a skbuff on rx 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/ipv4/ip_tunnel.c b/net/ipv4/ip_tunnel.c
index 88d7d7d..ac9fabe0 100644
--- a/net/ipv4/ip_tunnel.c
+++ b/net/ipv4/ip_tunnel.c
@@ -461,8 +461,7 @@
 		skb->dev = tunnel->dev;
 	}
 
-	if (!net_eq(tunnel->net, dev_net(tunnel->dev)))
-		skb_scrub_packet(skb, true);
+	skb_scrub_packet(skb, !net_eq(tunnel->net, dev_net(tunnel->dev)));
 
 	gro_cells_receive(&tunnel->gro_cells, skb);
 	return 0;