dont try figure out listen_service_fd position if unset
dont try figure out listen_service_fd position if unset

Signed-off-by: Andy Green <b471f5a494de34531c9e5a6e15abda71edd49104@linaro.org>

pankona/libwebsockets,jmillan/libwebsockets,DaYeSquad/libwebsockets,tn0502/libwebsockets,wenqiwooo/syslog-libwebsockets,pankona/libwebsockets,cambridgehackers/libwebsockets,PureSwift/libwebsockets,lukasz-skalski/libwebsockets,pankona/libwebsockets,kaostao/libwebsockets,giovanni-liboni/libwebsockets,dumganhar/libwebsockets,dtebbs/libwebsockets,SoapyMan/libwebsockets,GroundControl-Solutions/libwebsockets,sartura/libwebsockets,turbulenz/libwebsockets,GroundControl-Solutions/libwebsockets,RobertoMalatesta/libwebsockets,JoakimSoderberg/libwebsockets,lukasz-skalski/libwebsockets,abligh/libwebsockets,PureSwift/libwebsockets,cambridgehackers/libwebsockets,RobertoMalatesta/libwebsockets,Chilledheart/libwebsockets,ralight/libwebsockets,cambridgehackers/libwebsockets,RobertoMalatesta/libwebsockets,DaYeSquad/libwebsockets,mralexgray/libwebsockets-xcode,antmicro/libwebsockets,peeracle/libwebsockets,sartura/libwebsockets,sartura/libwebsockets,pombredanne/libwebsockets,turbulenz/libwebsockets,giovanni-liboni/libwebsockets,JoakimSoderberg/libwebsockets,antmicro/libwebsockets,dumganhar/libwebsockets,DaYeSquad/libwebsockets,JoakimSoderberg/libwebsockets,SoapyMan/libwebsockets,dumganhar/libwebsockets,jmillan/libwebsockets,sartura/libwebsockets,jmillan/libwebsockets,gameclosure/libwebsockets,sartura/libwebsockets,antmicro/libwebsockets,dtebbs/libwebsockets,weimingtom/libwebsockets,jmillan/libwebsockets,maws/libwebsockets,sanyaade-teachings/libwebsockets,dtebbs/libwebsockets,mushroomgithub/libwebsockets,maws/libwebsockets,mushroomgithub/libwebsockets,IOPOINT/libwebsockets,pombredanne/libwebsockets,pebble/libwebsockets,tn0502/libwebsockets,gameclosure/libwebsockets,maws/libwebsockets,Chilledheart/libwebsockets,weimingtom/libwebsockets,abligh/libwebsockets,pebble/libwebsockets,abligh/libwebsockets,peeracle/libwebsockets,giovanni-liboni/libwebsockets,sartura/libwebsockets,Chilledheart/libwebsockets,GroundControl-Solutions/libwebsockets,IOPOINT/libwebsockets,peeracle/libwebsockets,lukasz-skalski/libwebsockets,canopy-project/libwebsockets-canopy,turbulenz/libwebsockets,pombredanne/libwebsockets,IOPOINT/libwebsockets,SoapyMan/libwebsockets,pankona/libwebsockets,JoakimSoderberg/libwebsockets,mushroomgithub/libwebsockets,mralexgray/libwebsockets-xcode,lukasz-skalski/libwebsockets,mralexgray/libwebsockets-xcode,mushroomgithub/libwebsockets,pebble/libwebsockets,sanyaade-teachings/libwebsockets,ralight/libwebsockets,PureSwift/libwebsockets,peeracle/libwebsockets,PureSwift/libwebsockets,antmicro/libwebsockets,Chilledheart/libwebsockets,gameclosure/libwebsockets,maws/libwebsockets,RobertoMalatesta/libwebsockets,GroundControl-Solutions/libwebsockets,abligh/libwebsockets,pombredanne/libwebsockets,giovanni-liboni/libwebsockets,pebble/libwebsockets,kaostao/libwebsockets,kaostao/libwebsockets,dumganhar/libwebsockets,ralight/libwebsockets,ralight/libwebsockets,sanyaade-teachings/libwebsockets,kaostao/libwebsockets,peeracle/libwebsockets,wenqiwooo/syslog-libwebsockets,DaYeSquad/libwebsockets,PureSwift/libwebsockets,gameclosure/libwebsockets,tn0502/libwebsockets,weimingtom/libwebsockets,wenqiwooo/syslog-libwebsockets,SoapyMan/libwebsockets,SoapyMan/libwebsockets,GroundControl-Solutions/libwebsockets,tn0502/libwebsockets,weimingtom/libwebsockets,sanyaade-teachings/libwebsockets,dtebbs/libwebsockets,canopy-project/libwebsockets-canopy,wenqiwooo/syslog-libwebsockets,mralexgray/libwebsockets-xcode,ralight/libwebsockets,canopy-project/libwebsockets-canopy,dumganhar/libwebsockets,cambridgehackers/libwebsockets,sartura/libwebsockets,DaYeSquad/libwebsockets