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-msic.c b/drivers/gpio/gpio-msic.c
index 27ea7b9..d75eaa3 100644
--- a/drivers/gpio/gpio-msic.c
+++ b/drivers/gpio/gpio-msic.c
@@ -259,7 +259,7 @@
 static int platform_msic_gpio_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
-	struct intel_msic_gpio_pdata *pdata = dev->platform_data;
+	struct intel_msic_gpio_pdata *pdata = dev_get_platdata(dev);
 	struct msic_gpio *mg;
 	int irq = platform_get_irq(pdev, 0);
 	int retval;