rtc: rtc-sh: remove unnecessary platform_set_drvdata()

The driver core clears the driver data to NULL after device_release or
on probe failure, since commit 0998d063100 ("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: Jingoo Han <jg1.han@samsung.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

drivers/rtc/rtc-sh.c

@@ -770,8 +770,6 @@ static int __exit sh_rtc_remove(struct platform_device *pdev)
 	clk_disable(rtc->clk);
 	clk_put(rtc->clk);
 
-	platform_set_drvdata(pdev, NULL);
-
 	kfree(rtc);
 
 	return 0;