minor code rearrangements:

+ place the link field at the beginning of struct sip_pvt, 
  and not somewhere in the middle;
 
+ in __sip_reliable_xmit, remove a duplicate assignment, and
  put the statements in a more logical order (i.e. first copy
  the payload and associated info, then copy arguments from the
  caller, then finish initializing the headers...)
 
nothing to backport.



git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@77766 65c4cc65-6c06-0410-ace0-fbb531ad65f3