refrain from asserting when callback is invoked with null sock or sock->ssl. Also adjust style.
refrain from asserting when callback is invoked with null sock or sock->ssl. Also adjust style.

deweerdt/h2o,yannick/h2o,h2o/h2o,cwyang/h2o,yannick/h2o,cwyang/h2o,h2o/h2o,devnexen/h2o,deweerdt/h2o,devnexen/h2o,yannick/h2o,deweerdt/h2o,devnexen/h2o,devnexen/h2o,h2o/h2o,deweerdt/h2o,cwyang/h2o,deweerdt/h2o,deweerdt/h2o,h2o/h2o,cwyang/h2o,devnexen/h2o,h2o/h2o,devnexen/h2o,deweerdt/h2o,yannick/h2o,cwyang/h2o,yannick/h2o,devnexen/h2o,deweerdt/h2o,devnexen/h2o,yannick/h2o,cwyang/h2o,yannick/h2o,h2o/h2o,cwyang/h2o,h2o/h2o,yannick/h2o,devnexen/h2o,yannick/h2o,cwyang/h2o,h2o/h2o,deweerdt/h2o,h2o/h2o