Input: ads7846 - fix gpio_pendown configuration

The pendown gpio was requested but not configured for input.
Configure it for input.

Signed-off-by: Igor Grinberg <[e-mail]>
Signed-off-by: Dmitry Torokhov <[e-mail]>

drivers/input/touchscreen/ads7846.c

···
 				pdata->gpio_pendown);
 			return err;
 		}
+		err = gpio_direction_input(pdata->gpio_pendown);
+		if (err) {
+			dev_err(&spi->dev, "failed to setup pendown GPIO%d\n",
+				pdata->gpio_pendown);
+			gpio_free(pdata->gpio_pendown);
+			return err;
+		}
 
 		ts->gpio_pendown = pdata->gpio_pendown;