code guidelines cleanup for retrans_pkt() function

I am doing work in this function.  I noticed a large number of
coding guidline fixes that needed to be made.  Rather than have
those changes distract from my functional changes I decided
to separate these into a separate patch.



git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@272652 65c4cc65-6c06-0410-ace0-fbb531ad65f3