Fix memory leak
Fix memory leak

Fixes Coverity CID 1496170

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