Fix miswritten address of author in pcm_decode.c
This line is misreplaced
* audio/pcm_decode.c
*
* Copyright (C) 2014 Gregory Nutt. All rights reserved.
- * Author: Gregory Nutt <gnutt@tinyara.org>
+ * Author: Gregory Nutt <gnutt@nuttx.org>
*
* Based on the original audio framework from:
*
