tty: ar933x_uart: remove superfluous assignment of ar933x_uart_driver.nr

The 'nr' field of the 'ar933x_uart_driver' structure
is already initialized with the same value in the static
declaration. Remove the superfluous assignment in the
module init routine.
Signed-off-by: NGabor Juhos <juhosg@openwrt.org>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/tty/serial/ar933x_uart.c

@@ -730,7 +730,6 @@ static int __init ar933x_uart_init(void)
 {
 	int ret;
 
-	ar933x_uart_driver.nr = CONFIG_SERIAL_AR933X_NR_UARTS;
 	ret = uart_register_driver(&ar933x_uart_driver);
 	if (ret)
 		goto err_out;