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

[David Miller]

From: Wei Yongjun <weiyj.lk at gmail.com>
Date: Sat, 27 Apr 2013 18:13:16 +0800

> 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>

Applied.