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-em.c b/drivers/gpio/gpio-em.c
index eca119b..c6e1f08 100644
--- a/drivers/gpio/gpio-em.c
+++ b/drivers/gpio/gpio-em.c
@@ -253,7 +253,7 @@
 static int em_gio_probe(struct platform_device *pdev)
 {
 	struct gpio_em_config pdata_dt;
-	struct gpio_em_config *pdata = pdev->dev.platform_data;
+	struct gpio_em_config *pdata = dev_get_platdata(&pdev->dev);
 	struct em_gio_priv *p;
 	struct resource *io[2], *irq[2];
 	struct gpio_chip *gpio_chip;