Follow up to r1288.
Follow up to r1288.

* outgoing.c
  (serf__conn_update_pollset):
    Use the new 'written' field as a flag instead of setting setup to NULL.

Manouchehri/serf,Manouchehri/serf,liuzongquan/serf,justinweb/serf,blueszhangsh/serf,sworda/serf,justinweb/serf,justinweb/serf,wzugang/serf,muthusuba/serf,krime/serf,muthusuba/serf,idomon/serf,Manouchehri/serf,blueszhangsh/serf,TommyU/serf,muthusuba/serf,sworda/serf,TommyU/serf,blueszhangsh/serf,wzugang/serf,sworda/serf,blueszhangsh/serf,Manouchehri/serf,justinweb/serf,TommyU/serf,idomon/serf,wzugang/serf,idomon/serf,muthusuba/serf,idomon/serf,krime/serf,liuzongquan/serf,wzugang/serf,krime/serf,krime/serf,sworda/serf,liuzongquan/serf,liuzongquan/serf,TommyU/serf