drivers/memstick/host/rtsx_pci_ms.c: remove unnecessary platform_set_drvdata()

The driver core clears the driver data to NULL after device_release or on
probe failure. Thus, it is not needed to manually clear the device driver
data to NULL.

Signed-off-by: Jingoo Han <[e-mail]>
Cc: Maxim Levitsky <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
Signed-off-by: Linus Torvalds <[e-mail]>

drivers/memstick/host/rtsx_pci_ms.c

···
 	memstick_remove_host(msh);
 	memstick_free_host(msh);
 
-	platform_set_drvdata(pdev, NULL);
-
 	dev_dbg(&(pdev->dev),
 		": Realtek PCI-E Memstick controller has been removed\n");