if the mbuf utility in copy_it_in is called with length=0 it will copy all.. yet our length will be 0... this is incorrect. If we do get  a call to copy 0 len, then go ahead and set things up, but skip the copy. This will allow us to properly setup and handle if the pre-block somehow bleeds through.
if the mbuf utility in copy_it_in is called with length=0
it will copy all.. yet our length will be 0... this is
incorrect. If we do get  a call to copy 0 len, then
go ahead and set things up, but skip the copy. This
will allow us to properly setup and handle
if the pre-block somehow bleeds through.

gale320/sctp-refimpl,tosakanth/sctp-refimpl,sdd330/sctp-refimpl,TopPano/sctp-refimpl,tosakanth/sctp-refimpl,timsuchanek/sctp-refimpl,TopPano/sctp-refimpl,TopPano/sctp-refimpl,TopPano/sctp-refimpl,tosakanth/sctp-refimpl,sdd330/sctp-refimpl,sctplab/sctp-refimpl,xwhuang/sctp-refimpl,sdd330/sctp-refimpl,timsuchanek/sctp-refimpl,deepak899/sctp-refimpl,TopPano/sctp-refimpl,timsuchanek/sctp-refimpl,gale320/sctp-refimpl,gale320/sctp-refimpl,xwhuang/sctp-refimpl,sdd330/sctp-refimpl,sctplab/sctp-refimpl,timsuchanek/sctp-refimpl,tosakanth/sctp-refimpl,gale320/sctp-refimpl,gale320/sctp-refimpl,sdd330/sctp-refimpl,deepak899/sctp-refimpl,gale320/sctp-refimpl,TopPano/sctp-refimpl,sdd330/sctp-refimpl,sctplab/sctp-refimpl,sdd330/sctp-refimpl,deepak899/sctp-refimpl,ossy-szeged/sctp-refimpl,tosakanth/sctp-refimpl,sctplab/sctp-refimpl,timsuchanek/sctp-refimpl,timsuchanek/sctp-refimpl,timsuchanek/sctp-refimpl,xwhuang/sctp-refimpl,ossy-szeged/sctp-refimpl,sctplab/sctp-refimpl,timsuchanek/sctp-refimpl,deepak899/sctp-refimpl,deepak899/sctp-refimpl,ossy-szeged/sctp-refimpl,ossy-szeged/sctp-refimpl,tosakanth/sctp-refimpl,tosakanth/sctp-refimpl,TopPano/sctp-refimpl,sctplab/sctp-refimpl,gale320/sctp-refimpl,ossy-szeged/sctp-refimpl,TopPano/sctp-refimpl,gale320/sctp-refimpl,timsuchanek/sctp-refimpl,xwhuang/sctp-refimpl,xwhuang/sctp-refimpl,ossy-szeged/sctp-refimpl,tosakanth/sctp-refimpl,ossy-szeged/sctp-refimpl,sdd330/sctp-refimpl,gale320/sctp-refimpl,deepak899/sctp-refimpl,tosakanth/sctp-refimpl,sdd330/sctp-refimpl,ossy-szeged/sctp-refimpl,xwhuang/sctp-refimpl,ossy-szeged/sctp-refimpl,TopPano/sctp-refimpl