[PATCH] serial: sunsu: add missing platform_driver_unregister() when module exit

[Wei Yongjun]

From: Wei Yongjun <yongjun_wei at trendmicro.com.cn>

We have registered platform driver when module init, and
need unregister it when module exit.

Signed-off-by: Wei Yongjun <yongjun_wei at trendmicro.com.cn>
---
no compile test.
---
 drivers/tty/serial/sunsu.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/tty/serial/sunsu.c b/drivers/tty/serial/sunsu.c
index 451687c..0d84657 100644
--- a/drivers/tty/serial/sunsu.c
+++ b/drivers/tty/serial/sunsu.c
@@ -1592,6 +1592,7 @@ static int __init sunsu_init(void)
 
 static void __exit sunsu_exit(void)
 {
+	platform_driver_unregister(&su_driver);
 	if (sunsu_reg.nr)
 		sunserial_unregister_minors(&sunsu_reg, sunsu_reg.nr);
 }