Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/drivers/rtc/rtc-ac100.c b/drivers/rtc/rtc-ac100.c
index 784b676..2922393 100644
--- a/drivers/rtc/rtc-ac100.c
+++ b/drivers/rtc/rtc-ac100.c
@@ -1,18 +1,10 @@
+// SPDX-License-Identifier: GPL-2.0-only
 /*
  * RTC Driver for X-Powers AC100
  *
  * Copyright (c) 2016 Chen-Yu Tsai
  *
  * Chen-Yu Tsai <wens@csie.org>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
  */
 
 #include <linux/bcd.h>
@@ -586,10 +578,8 @@
 	chip->regmap = ac100->regmap;
 
 	chip->irq = platform_get_irq(pdev, 0);
-	if (chip->irq < 0) {
-		dev_err(&pdev->dev, "No IRQ resource\n");
+	if (chip->irq < 0)
 		return chip->irq;
-	}
 
 	chip->rtc = devm_rtc_allocate_device(&pdev->dev);
 	if (IS_ERR(chip->rtc))
@@ -620,15 +610,7 @@
 	if (ret)
 		return ret;
 
-	ret = rtc_register_device(chip->rtc);
-	if (ret) {
-		dev_err(&pdev->dev, "unable to register device\n");
-		return ret;
-	}
-
-	dev_info(&pdev->dev, "RTC enabled\n");
-
-	return 0;
+	return rtc_register_device(chip->rtc);
 }
 
 static int ac100_rtc_remove(struct platform_device *pdev)