Restore mistakenly removed period after "DivX, Inc".

git-svn-id: file:///var/local/repositories/ffmpeg/trunk@16686 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b

libavformat/avisynth.c

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