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 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>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

drivers/rtc/rtc-ep93xx.c

@@ -167,7 +167,6 @@ static int ep93xx_rtc_probe(struct platform_device *pdev)
 	return 0;
 
 exit:
-	platform_set_drvdata(pdev, NULL);
 	pdev->dev.platform_data = NULL;
 	return err;
 }
@@ -175,7 +174,6 @@ static int ep93xx_rtc_probe(struct platform_device *pdev)
 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;