ipip: Fix bug added to ipip_tunnel_xmit().

We can remove the rt_gateway == 0 check but we shouldn't
remove the 'dst' initialization too.

Noticed by Eric Dumazet.

Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/ipv4/ipip.c b/net/ipv4/ipip.c
index 87c63b6..f84ebff 100644
--- a/net/ipv4/ipip.c
+++ b/net/ipv4/ipip.c
@@ -454,6 +454,7 @@
 			dev->stats.tx_fifo_errors++;
 			goto tx_error;
 		}
+		dst = rt->rt_gateway;
 	}
 
 	rt = ip_route_output_ports(dev_net(dev), &fl4, NULL,