rtc: rtc-coh90133: use devm_rtc_device_register()

devm_rtc_device_register() is device managed and makes cleanup
paths simpler.

Signed-off-by: Jingoo Han <jg1.han@samsung.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

drivers/rtc/rtc-coh901331.c

@@ -155,7 +155,6 @@ static int __exit coh901331_remove(struct platform_device *pdev)
 	struct coh901331_port *rtap = dev_get_drvdata(&pdev->dev);
 
 	if (rtap) {
-		rtc_device_unregister(rtap->rtc);
 		clk_unprepare(rtap->clk);
 		platform_set_drvdata(pdev, NULL);
 	}
@@ -211,8 +210,8 @@ static int __init coh901331_probe(struct platform_device *pdev)
 	clk_disable(rtap->clk);
 
 	platform_set_drvdata(pdev, rtap);
-	rtap->rtc = rtc_device_register("coh901331", &pdev->dev, &coh901331_ops,
-					 THIS_MODULE);
+	rtap->rtc = devm_rtc_device_register(&pdev->dev, "coh901331",
+					&coh901331_ops, THIS_MODULE);
 	if (IS_ERR(rtap->rtc)) {
 		ret = PTR_ERR(rtap->rtc);
 		goto out_no_rtc;