vsrc_buffer: remove duplicated file description

libavfilter/vsrc_buffer.h

@@ -1,5 +1,4 @@
 /*
- * Memory buffer source filter
  * Copyright (c) 2008 Vitor Sessak
  *
  * This file is part of FFmpeg.
@@ -27,7 +26,6 @@
  * memory buffer source API for video
  */
 
-
 #include "avfilter.h"
 
 /**