SUNRPC: Never reuse the socket port after an xs_close()

If we call xs_close(), we're in one of two situations:
 - Autoclose, which means we don't expect to resend a request
 - bind+connect failed, which probably means the port is in use

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Cc: stable@kernel.org
diff --git a/net/sunrpc/xprtsock.c b/net/sunrpc/xprtsock.c
index be96d42..1e336a0 100644
--- a/net/sunrpc/xprtsock.c
+++ b/net/sunrpc/xprtsock.c
@@ -710,6 +710,8 @@
 	if (sk == NULL)
 		return;
 
+	transport->srcport = 0;
+
 	write_lock_bh(&sk->sk_callback_lock);
 	transport->inet = NULL;
 	transport->sock = NULL;