Fixed comment mentioning the renamed A2_STATECLOSE flag

This flag is now replaced by A2_AUTOCLOSE, which also replaces the unused
A2_CFGCLOSE.

include/a2_drivers.h

@@ -1,7 +1,7 @@
 /*
  * a2_drivers.h - Audiality 2 device driver and configuration interfaces
  *
- * Copyright 2012-2016 David Olofson <david@olofson.net>
+ * Copyright 2012-2017 David Olofson <david@olofson.net>
  *
  * This software is provided 'as-is', without any express or implied warranty.
  * In no event will the authors be held liable for any damages arising from the
@@ -88,7 +88,7 @@ struct A2_config
  *
  * NOTE:
  *	The returned A2_config must be closed using a2_CloseConfig(), unless
- *	the A2_STATECLOSE flag is used, and the config is used with a2_Open().
+ *	the A2_AUTOCLOSE flag is used, and the config is used with a2_Open().
  */
 A2_config *a2_OpenConfig(int samplerate, int buffer, int channels, int flags);