Initialize additional variables, to prevent a possible crash.

(closes issue #15186)
 Reported by: ajohnson
 Patches: 
       20090528__issue15186.diff.txt uploaded by tilghman (license 14)
 Tested by: ajohnson


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@201531 65c4cc65-6c06-0410-ace0-fbb531ad65f3