rtc: rtc-at91sam9: 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-at91sam9.c

···
 	rtc->rtt = devm_ioremap(&pdev->dev, r->start, resource_size(r));
 	if (!rtc->rtt) {
 		dev_err(&pdev->dev, "failed to map registers, aborting.\n");
-		ret = -ENOMEM;
-		goto fail;
+		return -ENOMEM;
 	}
 
 	rtc->gpbr = devm_ioremap(&pdev->dev, r_gpbr->start,
 				resource_size(r_gpbr));
 	if (!rtc->gpbr) {
 		dev_err(&pdev->dev, "failed to map gpbr registers, aborting.\n");
-		ret = -ENOMEM;
-		goto fail;
+		return -ENOMEM;
 	}
 
 	mr = rtt_readl(rtc, MR);
···
 
 	rtc->rtcdev = devm_rtc_device_register(&pdev->dev, pdev->name,
 					&at91_rtc_ops, THIS_MODULE);
-	if (IS_ERR(rtc->rtcdev)) {
-		ret = PTR_ERR(rtc->rtcdev);
-		goto fail;
-	}
+	if (IS_ERR(rtc->rtcdev))
+		return PTR_ERR(rtc->rtcdev);
 
 	/* register irq handler after we know what name we'll use */
 	ret = devm_request_irq(&pdev->dev, rtc->irq, at91_rtc_interrupt,
 				IRQF_SHARED, dev_name(&rtc->rtcdev->dev), rtc);
 	if (ret) {
 		dev_dbg(&pdev->dev, "can't share IRQ %d?\n", rtc->irq);
-		goto fail;
+		return ret;
 	}
 
 	/* NOTE:  sam9260 rev A silicon has a ROM bug which resets the
···
 				dev_name(&rtc->rtcdev->dev));
 
 	return 0;
-
-fail:
-	platform_set_drvdata(pdev, NULL);
-	return ret;
 }
 
 /*
···
 	/* disable all interrupts */
 	rtt_writel(rtc, MR, mr & ~(AT91_RTT_ALMIEN | AT91_RTT_RTTINCIEN));
 
-	platform_set_drvdata(pdev, NULL);
 	return 0;
 }