Plug a memory leak when reading configs with their comments.

Plug a memory leak when reading configs with their comments.

While reading through configuration files with the intent of returning their
full contents (comments specifically) we allocated some memory and then forgot
to free it.  This doesn't fix 16554 but clears up a leak I had in the lab.

(issue #16554)
Reported by: mav3rick
Patches:
      issue16554_20100118.patch uploaded by seanbright (license 71)
Tested by: seanbright

git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.4@241015 65c4cc65-6c06-0410-ace0-fbb531ad65f3