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-ucb1400.c b/drivers/gpio/gpio-ucb1400.c
index 6d0feb2..1a605f2 100644
--- a/drivers/gpio/gpio-ucb1400.c
+++ b/drivers/gpio/gpio-ucb1400.c
@@ -45,7 +45,7 @@
 
 static int ucb1400_gpio_probe(struct platform_device *dev)
 {
-	struct ucb1400_gpio *ucb = dev->dev.platform_data;
+	struct ucb1400_gpio *ucb = dev_get_platdata(&dev->dev);
 	int err = 0;
 
 	if (!(ucb && ucb->gpio_offset)) {