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-f7188x.c b/drivers/gpio/gpio-f7188x.c
index 1734e4f..2be7337 100644
--- a/drivers/gpio/gpio-f7188x.c
+++ b/drivers/gpio/gpio-f7188x.c
@@ -298,7 +298,7 @@
 {
 	int err;
 	int i;
-	struct f7188x_sio *sio = pdev->dev.platform_data;
+	struct f7188x_sio *sio = dev_get_platdata(&pdev->dev);
 	struct f7188x_gpio_data *data;
 
 	data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);