serial: mxs-auart: Fix build error

Commit 343fda95481a7254f ("serial: mxs-auart: properly handle mctrl_gpio
failing") introduced the following build error:

  CC      drivers/tty/serial/mxs-auart.o
drivers/tty/serial/mxs-auart.c: In function 'mxs_auart_probe':
drivers/tty/serial/mxs-auart.c:1282:3: error: unknown type name 'got'

Fix it by providing a proper return code.

Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
Acked-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/tty/serial/mxs-auart.c

@@ -1279,7 +1279,7 @@ static int mxs_auart_probe(struct platform_device *pdev)
 	ret = mxs_auart_init_gpios(s, &pdev->dev);
 	if (ret) {
 		dev_err(&pdev->dev, "Failed to initialize GPIOs.\n");
-		got out_free_irq;
+		return ret;
 	}
 
 	/*