Recorded merge of revisions 314822 via svnmerge from

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

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  r314822 | russell | 2011-04-22 09:34:23 -0500 (Fri, 22 Apr 2011) | 11 lines

  Initialize buffers in getvar and getvarfull.

  Initialize the buffers used to hold the result from GET VARIABLE or
  GET VARIABLE FULL.  The bug report shows func_read returning garbage in
  the result.  It assumed that the buffer passed in was initialized, like many
  other functions do.  In the more common code path (through the dialplan), it
  is initialized, so just initialize it here too.

  (closes issue #19050)
  Reported by: johnz
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