dma: 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: Vinod Koul <vinod.koul@intel.com>
diff --git a/drivers/dma/sh/shdma-of.c b/drivers/dma/sh/shdma-of.c
index 11bcb05..966aaab 100644
--- a/drivers/dma/sh/shdma-of.c
+++ b/drivers/dma/sh/shdma-of.c
@@ -42,7 +42,7 @@
 
 static int shdma_of_probe(struct platform_device *pdev)
 {
-	const struct of_dev_auxdata *lookup = pdev->dev.platform_data;
+	const struct of_dev_auxdata *lookup = dev_get_platdata(&pdev->dev);
 	int ret;
 
 	if (!lookup)