Restore mistakenly removed period after "DivX, Inc".

Originally committed as revision 16686 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavformat/avisynth.c

 /*
  * AVISynth support for ffmpeg system
- * Copyright (c) 2006 DivX, Inc
+ * Copyright (c) 2006 DivX, Inc.
  *
  * This file is part of FFmpeg.
  *