net: geneve: set IFF_POINTOPOINT with IFLA_GENEVE_INNER_PROTO_INHERIT

The GENEVE tunnel used with IFLA_GENEVE_INNER_PROTO_INHERIT is
point-to-point, so set IFF_POINTOPOINT to reflect that.
Signed-off-by: Josef Miegl <josef@miegl.cz>
Reviewed-by: Simon Horman <simon.horman@corigine.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/geneve.c

@@ -1426,7 +1426,7 @@ static int geneve_configure(struct net *net, struct net_device *dev,
 		dev->type = ARPHRD_NONE;
 		dev->hard_header_len = 0;
 		dev->addr_len = 0;
-		dev->flags = IFF_NOARP;
+		dev->flags = IFF_POINTOPOINT | IFF_NOARP;
 	}
 
 	err = register_netdevice(dev);