- use '=' to copy struct sockaddr_in

- localize a variable
- replace three replicas of the same code with a much simpler construct
  removing replicated var = var->next;
- use '?' instead of 'if' for an assignment



git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@20224 65c4cc65-6c06-0410-ace0-fbb531ad65f3