dma: use platform_{get,set}_drvdata()

Use the wrapper functions for getting and setting the driver data using
platform_device instead of using dev_{get,set}_drvdata() with &pdev->dev,
so we can directly pass a struct platform_device.

Also, unnecessary dev_set_drvdata() is removed, because the driver core
clears the driver data to NULL after device_release or on probe failure.

Signed-off-by: Jingoo Han <jg1.han@samsung.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
diff --git a/drivers/dma/fsldma.c b/drivers/dma/fsldma.c
index 4fc2980..49e8fbd 100644
--- a/drivers/dma/fsldma.c
+++ b/drivers/dma/fsldma.c
@@ -1368,7 +1368,7 @@
 
 	dma_set_mask(&(op->dev), DMA_BIT_MASK(36));
 
-	dev_set_drvdata(&op->dev, fdev);
+	platform_set_drvdata(op, fdev);
 
 	/*
 	 * We cannot use of_platform_bus_probe() because there is no
@@ -1417,7 +1417,7 @@
 	struct fsldma_device *fdev;
 	unsigned int i;
 
-	fdev = dev_get_drvdata(&op->dev);
+	fdev = platform_get_drvdata(op);
 	dma_async_device_unregister(&fdev->common);
 
 	fsldma_free_irqs(fdev);
@@ -1428,7 +1428,6 @@
 	}
 
 	iounmap(fdev->regs);
-	dev_set_drvdata(&op->dev, NULL);
 	kfree(fdev);
 
 	return 0;