Merged revisions 188582 via svnmerge from

https://origsvn.digium.com/svn/asterisk/branches/1.4

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  r188582 | mmichelson | 2009-04-15 15:04:20 -0500 (Wed, 15 Apr 2009) | 7 lines
  
  Update ast_readvideo_callback to match ast_readaudio_callback.
  
  This fixes potential refcount errors that may occur on ast_filestreams.
  
  AST-208
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git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@188585 65c4cc65-6c06-0410-ace0-fbb531ad65f3