Fix a crash reported to me by hads on IRC. This crash would occur with the use

Fix a crash reported to me by hads on IRC.  This crash would occur with the use
of the "distinctiveringaftercid" option.  Also, on this user's system, the crash
would only occur when built without optimizations.  This is because the bug is
that the code would write past the end of an array that was allocated on the
stack, and the structure of the stack is different with or without optimizations
enabled.

git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.2@39081 65c4cc65-6c06-0410-ace0-fbb531ad65f3