fixing stupid mistake with putting code before variable declaration

fixing stupid mistake with putting code before variable declaration
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  Merged revisions 313433 via svnmerge from
  https://origsvn.digium.com/svn/asterisk/branches/1.6.2

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    r313432 | jrose | 2011-04-12 13:12:29 -0500 (Tue, 12 Apr 2011) | 14 lines

	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@313435 65c4cc65-6c06-0410-ace0-fbb531ad65f3