Cleanup fsk spill if off hook is detected during mwi spill.

Correct logic error in handling events when sending mwi spill 
(closes issue #14143)
Reported by: alecdavis
Patches:
      chan_dahdi.handle_init_event2.diff.txt uploaded by dbailey



git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@167416 65c4cc65-6c06-0410-ace0-fbb531ad65f3