Merge "include: dsp: avoid returning error code from stubbed function"

include/dsp/audio_notifier.h

@@ -1,4 +1,4 @@
-/* Copyright (c) 2016, The Linux Foundation. All rights reserved.
+/* Copyright (c) 2016, 2018, The Linux Foundation. All rights reserved.
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 and
@@ -92,7 +92,7 @@ int audio_notifier_deregister(char *client_name);
 static inline int audio_notifier_register(char *client_name, int domain,
 					  struct notifier_block *nb)
 {
-	return -ENODEV;
+	return 0;
 }
 
 static inline int audio_notifier_deregister(char *client_name)