leds: 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: Bryan Wu <cooloney@gmail.com>
diff --git a/drivers/leds/leds-lm3642.c b/drivers/leds/leds-lm3642.c
index f361bbe..ceb6b3c 100644
--- a/drivers/leds/leds-lm3642.c
+++ b/drivers/leds/leds-lm3642.c
@@ -316,7 +316,7 @@
 static int lm3642_probe(struct i2c_client *client,
 				  const struct i2c_device_id *id)
 {
-	struct lm3642_platform_data *pdata = client->dev.platform_data;
+	struct lm3642_platform_data *pdata = dev_get_platdata(&client->dev);
 	struct lm3642_chip_data *chip;
 
 	int err;