Don't ask me why, but waitfordigit will immediately return a 1 on my system,...

Don't ask me why, but waitfordigit will immediately return a 1 on my system, unless the outfd is initialized to -1 before calling the nandfds func

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@79378 65c4cc65-6c06-0410-ace0-fbb531ad65f3