Fix a crash due to the wrong variable being used when building a directory string.

(closes issue #12027)
Reported by: jaroth
Patches:
      forward.patch uploaded by jaroth (license 50)
Tested by: jaroth



git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@103902 65c4cc65-6c06-0410-ace0-fbb531ad65f3