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-max730x.c b/drivers/gpio/gpio-max730x.c
index 0009234..f4f4ed1 100644
--- a/drivers/gpio/gpio-max730x.c
+++ b/drivers/gpio/gpio-max730x.c
@@ -166,7 +166,7 @@
 	struct max7301_platform_data *pdata;
 	int i, ret;
 
-	pdata = dev->platform_data;
+	pdata = dev_get_platdata(dev);
 
 	mutex_init(&ts->lock);
 	dev_set_drvdata(dev, ts);