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-da9055.c b/drivers/gpio/gpio-da9055.c
index fd6dfe3..7ef0820 100644
--- a/drivers/gpio/gpio-da9055.c
+++ b/drivers/gpio/gpio-da9055.c
@@ -150,7 +150,7 @@
 		return -ENOMEM;
 
 	gpio->da9055 = dev_get_drvdata(pdev->dev.parent);
-	pdata = gpio->da9055->dev->platform_data;
+	pdata = dev_get_platdata(gpio->da9055->dev);
 
 	gpio->gp = reference_gp;
 	if (pdata && pdata->gpio_base)