rtc: rtc-bfin: remove unnecessary platform_set_drvdata()

The driver core clears the driver data to NULL after device_release or
on probe failure, since commit 0998d063 ("device-core: Ensure drvdata
= NULL when no driver is bound").  Thus, it is not needed to manually
clear the device driver data to NULL.
Signed-off-by: NJingoo Han <jg1.han@samsung.com>
Acked-by: NMike Frysinger <vapier@gentoo.org>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

drivers/rtc/rtc-bfin.c

@@ -391,7 +391,6 @@ static int bfin_rtc_remove(struct platform_device *pdev)
 	struct device *dev = &pdev->dev;
 
 	bfin_rtc_reset(dev, 0);
-	platform_set_drvdata(pdev, NULL);
 
 	return 0;
 }