Fix MWI update so LED display correct voicemail state after phone usage. Also fixes few warnings.
(closes issue #19675)
 Reported by: dbohling
 Patches: 
       fixmwi.patch uploaded by dbohling (license 6378)



git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@368688 65c4cc65-6c06-0410-ace0-fbb531ad65f3