Merged revisions 337119 via svnmerge from

https://origsvn.digium.com/svn/asterisk/branches/10

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  r337119 | rmudgett | 2011-09-20 17:47:45 -0500 (Tue, 20 Sep 2011) | 16 lines
  
  Fix crash with STRREPLACE function.
  
  The ast_func_read() function calls the .read2 callback with the len
  parameter set to zero indicating no size restrictions on the supplied
  ast_str buffer.  The value was used to dimension a local starts[] array
  with the array subsequently used.
  
  * Reworked the strreplace() function to perform the string replacement in
  a straight forward manner.  Eliminated the need for the starts[] array.
  
  (closes issue ASTERISK-18545)
  Reported by: Federico Alves
  Patches:
        jira_asterisk_18545_v10.patch (license #5621) patch uploaded by rmudgett
  Tested by: rmudgett, Federico Alves
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git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@337123 65c4cc65-6c06-0410-ace0-fbb531ad65f3