(closes issue #13409)

(closes issue #13409)
Reported by: tomaso
Patches:
      asterisk-1.6.0-rc2-cdrmemleak.patch uploaded by tomaso (license 564)

I basically spent the day, verifying that this patch
solves the problem, and doesn't hurt in non-problem
cases. Why valgrind did not plainly reveal this leak
absolutely mystifies and stuns me.

Many, many thanks to tomaso for finding and providing the fix.

git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.4@140670 65c4cc65-6c06-0410-ace0-fbb531ad65f3