ipv4: Fetch route saddr from flow key in tcp_v4_connect().

Now that output route lookups update the flow with
source address selection, we can fetch it from
fl4->saddr instead of rt->rt_src
Signed-off-by: David S. Miller <davem@davemloft.net>

net/ipv4/tcp_ipv4.c

@@ -193,7 +193,7 @@ int tcp_v4_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len)
 		daddr = rt->rt_dst;
 
 	if (!inet->inet_saddr)
-		inet->inet_saddr = rt->rt_src;
+		inet->inet_saddr = fl4.saddr;
 	inet->inet_rcv_saddr = inet->inet_saddr;
 
 	if (tp->rx_opt.ts_recent_stamp && inet->inet_daddr != daddr) {