Fix small memory leak when switching event loops
Fix small memory leak when switching event loops

shane-kerr/getdns,huitema/getdns,shane-kerr/getdns,huitema/getdns,shane-kerr/getdns,smogali/getdns,smogali/getdns,huitema/getdns,smogali/getdns,smogali/getdns,shane-kerr/getdns,huitema/getdns