Incoming overlap dialing no longer works after sig_pri extraction.

The problem would manifest itself if your dialplan matching could accept
more digits to match than were actually dialed.  The time out waiting for
overlap digits disconnected the call instead of matching any accumulated
digits to the dialplan.

Accidental conversion of a break out of loop as a break out of switch.

(closes issue #17401)
Reported by: avalentin
Patches:
      issue17401_digit_timeout.patch uploaded by rmudgett (license 664)
Tested by: avalentin, rmudgett


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@267928 65c4cc65-6c06-0410-ace0-fbb531ad65f3