pcm_decode: correction to RAW format support

corrects misplaced preprocessor directives for CONFIG_AUDIO_FORMAT_RAW

audio/pcm_decode.c

@@ -1182,14 +1182,16 @@ static int pcm_enqueuebuffer(FAR struct audio_lowerhalf_s *dev,
       priv->export.upper(priv->export.priv, AUDIO_CALLBACK_COMPLETE,
                          NULL, OK);
 #endif
-    }
 
 #ifndef CONFIG_AUDIO_FORMAT_RAW
+    }
+
   /* This is not a WAV file! */
 
   auderr("ERROR: Invalid PCM WAV file\n");
-  return -EINVAL;
 #endif
+
+  return -EINVAL;
 }
 
 /****************************************************************************