passing NULL for `%s` is UB
passing NULL for `%s` is UB

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