Make sure we set flags to a 0 value before trying to use it. Pointed out by...

Make sure we set flags to a 0 value before trying to use it.  Pointed out by seanbright while I was debugging issue 11109.

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@87393 65c4cc65-6c06-0410-ace0-fbb531ad65f3