cosmetics, remove useless dot

git-svn-id: file:///var/local/repositories/ffmpeg/trunk@13421 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b

libavformat/swfenc.c

 /*
- * Flash Compatible Streaming Format muxer.
+ * Flash Compatible Streaming Format muxer
  * Copyright (c) 2000 Fabrice Bellard.
  * Copyright (c) 2003 Tinic Uro.
  *