gpio: use dev_get_platdata()

Use the wrapper function for retrieving the platform data instead of
accessing dev->platform_data directly.

Signed-off-by: Nizam Haider <nijamh@cdac.in>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
diff --git a/drivers/gpio/gpio-octeon.c b/drivers/gpio/gpio-octeon.c
index 3c66ce4..afbb241 100644
--- a/drivers/gpio/gpio-octeon.c
+++ b/drivers/gpio/gpio-octeon.c
@@ -128,7 +128,7 @@
 
 static int octeon_gpio_remove(struct platform_device *pdev)
 {
-	struct gpio_chip *chip = pdev->dev.platform_data;
+	struct gpio_chip *chip = dev_get_platdata(&pdev->dev);
 	gpiochip_remove(chip);
 	return 0;
 }