Fixed compiler warning on Windows.
Fixed compiler warning on Windows.

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