Fix `stop` bug in wf_test (found with dialyzer, yo)
Fix `stop` bug in wf_test (found with dialyzer, yo)

nitrogen/nitrogen_core,stuart-thackray/nitrogen_core,nitrogen/nitrogen_core,nitrogen/nitrogen_core,choptastic/nitrogen_core,choptastic/nitrogen_core,SovereignPrime/nitrogen_core,SovereignPrime/nitrogen_core,stuart-thackray/nitrogen_core,nitrogen/nitrogen_core,choptastic/nitrogen_core,stuart-thackray/nitrogen_core,SovereignPrime/nitrogen_core