Merged revisions 185952 via svnmerge from

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

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  r185952 | kpfleming | 2009-04-02 08:43:43 -0500 (Thu, 02 Apr 2009) | 5 lines
  
  the DAHDI_GETCONF, DAHDI_SETCONF and DAHDI_GET_PARAMS ioctls were recently corrected to show that they do, in fact, read data from userspace as part of their work. due to this fix, valgrind now reports a number of cases where chan_dahdi passed an uninitialized (or partially) buffer to these ioctls, which could lead to unexpected behavior.
  
  this patch corrects chan_dahdi to ensure that buffers passed to these ioctls are always fully initialized.
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git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@185953 65c4cc65-6c06-0410-ace0-fbb531ad65f3