rtc: rtc-ep93xx: 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-ep93xx.c

···
 	return 0;
 
 exit:
-	platform_set_drvdata(pdev, NULL);
 	pdev->dev.platform_data = NULL;
 	return err;
 }
···
 static int ep93xx_rtc_remove(struct platform_device *pdev)
 {
 	sysfs_remove_group(&pdev->dev.kobj, &ep93xx_rtc_sysfs_files);
-	platform_set_drvdata(pdev, NULL);
 	pdev->dev.platform_data = NULL;
 
 	return 0;