fix heap-use-after-free bug
fix heap-use-after-free bug

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