[SPARC64]: Fix oops on runlevel change with serial console.

Incorrect uart_write_wakeup() calls cause reference to a
NULL tty pointer in sunsab and sunzilog serial drivers.

Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/serial/sunzilog.c b/drivers/serial/sunzilog.c
index d754457..7653d6c 100644
--- a/drivers/serial/sunzilog.c
+++ b/drivers/serial/sunzilog.c
@@ -517,10 +517,9 @@
 	if (up->port.info == NULL)
 		goto ack_tx_int;
 	xmit = &up->port.info->xmit;
-	if (uart_circ_empty(xmit)) {
-		uart_write_wakeup(&up->port);
+	if (uart_circ_empty(xmit))
 		goto ack_tx_int;
-	}
+
 	if (uart_tx_stopped(&up->port))
 		goto ack_tx_int;