fix compiler warning: pointer should be 'char *' instread of 'void *'
fix compiler warning: pointer should be 'char *' instread of 'void *'

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