rtc: rtc-at91rm9200: 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-at91rm9200.c

···
 
 	rtc_device_unregister(rtc);
 	iounmap(at91_rtc_regs);
-	platform_set_drvdata(pdev, NULL);
 
 	return 0;
 }