[PATCH] driver: tty: add missing unregister in err case

[Timur Tabi]

Libo Chen wrote:
> when platform_driver_register broken, we should unregister ucc_uart_driver
>
> Signed-off-by: Libo chen<libo.chen at huawei.com>

Acked-by: Timur Tabi <timur at tabi.org>

Thanks for catching this.

-- 
Timur Tabi