define MODULE_NAME as we call `h2o_req_log_error` more than once
define MODULE_NAME as we call `h2o_req_log_error` more than once

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