ipv4: Make output route lookup return rtable directly.

Instead of on the stack.

Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/infiniband/hw/cxgb3/iwch_cm.c

@@ -354,7 +354,8 @@ static struct rtable *find_route(struct t3cdev *dev, __be32 local_ip,
 			  }
 	};
 
-	if (ip_route_output_flow(&init_net, &rt, &fl, NULL))
+	rt = ip_route_output_flow(&init_net, &fl, NULL);
+	if (IS_ERR(rt))
 		return NULL;
 	return rt;
 }