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-wm831x-status.c b/drivers/leds/leds-wm831x-status.c
index 120815a..c32dad4 100644
--- a/drivers/leds/leds-wm831x-status.c
+++ b/drivers/leds/leds-wm831x-status.c
@@ -246,8 +246,8 @@
 	drvdata->wm831x = wm831x;
 	drvdata->reg = res->start;
 
-	if (wm831x->dev->platform_data)
-		chip_pdata = wm831x->dev->platform_data;
+	if (dev_get_platdata(wm831x->dev))
+		chip_pdata = dev_get_platdata(wm831x->dev);
 	else
 		chip_pdata = NULL;