ASoC: twl6040, fsl: use to_platform_device

Use to_platform_device() instead of open-coding it.

Signed-off-by: Geliang Tang <geliangtang@163.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
diff --git a/sound/soc/codecs/twl6040.c b/sound/soc/codecs/twl6040.c
index 4cad892..bc3de2e 100644
--- a/sound/soc/codecs/twl6040.c
+++ b/sound/soc/codecs/twl6040.c
@@ -1097,8 +1097,7 @@
 {
 	struct twl6040_data *priv;
 	struct twl6040 *twl6040 = dev_get_drvdata(codec->dev->parent);
-	struct platform_device *pdev = container_of(codec->dev,
-						   struct platform_device, dev);
+	struct platform_device *pdev = to_platform_device(codec->dev);
 	int ret = 0;
 
 	priv = devm_kzalloc(codec->dev, sizeof(*priv), GFP_KERNEL);