Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/sound/soc/intel/atom/sst-atom-controls.c b/sound/soc/intel/atom/sst-atom-controls.c
index 3672d36..baef461 100644
--- a/sound/soc/intel/atom/sst-atom-controls.c
+++ b/sound/soc/intel/atom/sst-atom-controls.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
  /*
  *  sst-atom-controls.c - Intel MID Platform driver DPCM ALSA controls for Mrfld
  *
@@ -6,15 +7,6 @@
  *	Vinod Koul <vinod.koul@intel.com>
  *  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  *
- *  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; version 2 of the License.
- *
- *  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.
- *
  *  In the dpcm driver modelling when a particular FE/BE/Mixer/Pipe is active
  *  we forward the settings and parameters, rest we keep the values  in
  *  driver and forward when DAPM enables them
@@ -647,7 +639,7 @@
 		set_mixer = false;
 	}
 
-	if (set_mixer == false)
+	if (!set_mixer)
 		return 0;
 
 	if (SND_SOC_DAPM_EVENT_ON(event) ||