Merged revisions 314358 via svnmerge from

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

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  r314358 | twilson | 2011-04-19 22:25:15 -0700 (Tue, 19 Apr 2011) | 4 lines
  
  Initialize track pointer
  
  ast_reentrancy_init checks to see if it is NULL before initializing with calloc
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git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@314359 65c4cc65-6c06-0410-ace0-fbb531ad65f3