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-pcf857x.c b/drivers/gpio/gpio-pcf857x.c
index e8faf53..e8835d6 100644
--- a/drivers/gpio/gpio-pcf857x.c
+++ b/drivers/gpio/gpio-pcf857x.c
@@ -262,7 +262,7 @@
 	struct pcf857x			*gpio;
 	int				status;
 
-	pdata = client->dev.platform_data;
+	pdata = dev_get_platdata(&client->dev);
 	if (!pdata) {
 		dev_dbg(&client->dev, "no platform data\n");
 	}
@@ -396,7 +396,7 @@
 
 static int pcf857x_remove(struct i2c_client *client)
 {
-	struct pcf857x_platform_data	*pdata = client->dev.platform_data;
+	struct pcf857x_platform_data	*pdata = dev_get_platdata(&client->dev);
 	struct pcf857x			*gpio = i2c_get_clientdata(client);
 	int				status = 0;