there is no need to use iax_frame_free here, as it will actually just end up

having a bunch of erroneous messages about attempting to double free frames
spammed to the console.  Problem reported to me by file ...


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@41629 65c4cc65-6c06-0410-ace0-fbb531ad65f3