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 <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
Signed-off-by: Linus Torvalds <[e-mail]>

drivers/rtc/rtc-sh.c

···
 	clk_disable(rtc->clk);
 	clk_put(rtc->clk);
 
-	platform_set_drvdata(pdev, NULL);
-
 	kfree(rtc);
 
 	return 0;