sctp: Remove rt->rt_src usage in sctp_v4_get_saddr()

Flow key is available, so fetch it from there.

Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/sctp/protocol.c b/net/sctp/protocol.c
index 4f270ac..4de77cb 100644
--- a/net/sctp/protocol.c
+++ b/net/sctp/protocol.c
@@ -566,7 +566,7 @@
 
 	if (rt) {
 		saddr->v4.sin_family = AF_INET;
-		saddr->v4.sin_addr.s_addr = rt->rt_src;
+		saddr->v4.sin_addr.s_addr = fl->u.ip4.saddr;
 	}
 }