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white space change

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  reload Chan_dahdi memory leak caused by variables

  chan_dahdi reloading with variables set via setvar in chan_dahdi.conf would
  stay in the dahdi_pvt structs for individual channels (causing them to just
  continue adding the new ones to the list) and also there was a memory leak
  causes by the conf objects. This patch resolves both of these by using
  ast_variables_destroy during the loading process.

  (closes issue #17450)
  Reported by: nahuelgreco

  Patches:
	  patch.diff uploaded by jrose (license 1225)
	  Tested by: tilghman, jrose

  Review: https://reviewboard.asterisk.org/r/1170/

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git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.6.2@313433 65c4cc65-6c06-0410-ace0-fbb531ad65f3