tools/nxstyle.c: Add capability to detect multiple blank lines. Single spacing required by the coding standard. Also coding standard fixes to server .c files for problems found during testing nxstyle.

audio/audio.c

@@ -66,6 +66,7 @@
 /****************************************************************************
  * Pre-processor Definitions
  ****************************************************************************/
+
 /* Debug ********************************************************************/
 /* Non-standard debug that may be enabled just for testing Audio */
 
@@ -416,6 +417,7 @@ static int audio_ioctl(FAR struct file *filep, int cmd, unsigned long arg)
           audinfo("AUDIOIOC_SHUTDOWN\n");
 
           /* Call the lower-half driver initialize handler */
+
           ret = lower->ops->shutdown(lower);
         }
         break;

audio/pcm_decode.c

@@ -62,6 +62,7 @@
 /****************************************************************************
  * Pre-processor Definitions
  ****************************************************************************/
+
 /* Configuration ************************************************************/
 
 #define CONFIG_PCM_DEBUG 1 /* For now */
@@ -79,6 +80,7 @@
 /****************************************************************************
  * Private Types
  ****************************************************************************/
+
 /* This structure describes the internal state of the PCM decoder */
 
 struct pcm_decode_s