gpio: use dev_get_platdata()

Use the wrapper function for retrieving the platform data instead of
accessing dev->platform_data directly.

Signed-off-by: Jingoo Han <jg1.han@samsung.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
diff --git a/drivers/gpio/gpio-kempld.c b/drivers/gpio/gpio-kempld.c
index 1bdc3a2..3f5b200 100644
--- a/drivers/gpio/gpio-kempld.c
+++ b/drivers/gpio/gpio-kempld.c
@@ -150,7 +150,7 @@
 {
 	struct device *dev = &pdev->dev;
 	struct kempld_device_data *pld = dev_get_drvdata(dev->parent);
-	struct kempld_platform_data *pdata = pld->dev->platform_data;
+	struct kempld_platform_data *pdata = dev_get_platdata(pld->dev);
 	struct kempld_gpio_data *gpio;
 	struct gpio_chip *chip;
 	int ret;