Resolve a file handle leak.

Resolve a file handle leak.

The frames here should have always been freed.  However, out of luck, there was
never any memory leaked.  However, after file streams became reference counted,
this code would leak the file stream for the file being read.

(closes issue #15181)
Reported by: jkroon

git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.4@196826 65c4cc65-6c06-0410-ace0-fbb531ad65f3