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>

sound/soc/fsl/p1022_rdk.c

@@ -203,8 +203,7 @@ static int p1022_rdk_probe(struct platform_device *pdev)
 {
 	struct device *dev = pdev->dev.parent;
 	/* ssi_pdev is the platform device for the SSI node that probed us */
-	struct platform_device *ssi_pdev =
-		container_of(dev, struct platform_device, dev);
+	struct platform_device *ssi_pdev = to_platform_device(dev);
 	struct device_node *np = ssi_pdev->dev.of_node;
 	struct device_node *codec_np = NULL;
 	struct machine_data *mdata;