Merged revisions 281760 via svnmerge from

https://origsvn.digium.com/svn/asterisk/branches/1.8

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  r281760 | mnicholson | 2010-08-11 12:27:59 -0500 (Wed, 11 Aug 2010) | 4 lines
  
  Avoid a deadlock in add_header_max_forwards().
  
  Related to r276951
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git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@281761 65c4cc65-6c06-0410-ace0-fbb531ad65f3