Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/sound/usb/caiaq/device.c b/sound/usb/caiaq/device.c
index d55ca48..b669e11 100644
--- a/sound/usb/caiaq/device.c
+++ b/sound/usb/caiaq/device.c
@@ -1,22 +1,9 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * caiaq.c: ALSA driver for caiaq/NativeInstruments devices
  *
  *   Copyright (c) 2007 Daniel Mack <daniel@caiaq.de>
  *                      Karsten Wiese <fzu@wemgehoertderstaat.de>
- *
- *   This program is free software; you can redistribute it and/or modify
- *   it under the terms of the GNU General Public License as published by
- *   the Free Software Foundation; either version 2 of the License, or
- *   (at your option) any later version.
- *
- *   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.
- *
- *   You should have received a copy of the GNU General Public License
- *   along with this program; if not, write to the Free Software
- *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 */
 
 #include <linux/moduleparam.h>
@@ -200,6 +187,7 @@
 			break;
 		}
 #ifdef CONFIG_SND_USB_CAIAQ_INPUT
+		/* fall through */
 	case EP1_CMD_READ_ERP:
 	case EP1_CMD_READ_ANALOG:
 		snd_usb_caiaq_input_dispatch(cdev, buf, urb->actual_length);