Merged revisions 268456 via svnmerge from

Merged revisions 268456 via svnmerge from
https://origsvn.digium.com/svn/asterisk/trunk

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  r268456 | tilghman | 2010-06-05 12:55:28 -0500 (Sat, 05 Jun 2010) | 14 lines

  Fix crash in DTMF detection.

  What I did not originally see in my previous commit was that even though the
  next digit could be detected before the previous was considered ended, the
  detection of the next digit effectively ends the detection of the previous.
  Therefore, the length moves in lockstep with the digit, and no separate counter
  is needed for the length alone.

  (closes issue #17371)
   Reported by: alecdavis

  (closes issue #17474)
   Reported by: kenner
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git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.6.2@268457 65c4cc65-6c06-0410-ace0-fbb531ad65f3