coverity 83660 plat unix check fcntl return
coverity 83660 plat unix check fcntl return

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

SoapyMan/libwebsockets,Chilledheart/libwebsockets,sartura/libwebsockets,jmillan/libwebsockets,mushroomgithub/libwebsockets,gameclosure/libwebsockets,SoapyMan/libwebsockets,jmillan/libwebsockets,dumganhar/libwebsockets,tn0502/libwebsockets,IOPOINT/libwebsockets,sartura/libwebsockets,sartura/libwebsockets,jmillan/libwebsockets,RobertoMalatesta/libwebsockets,PureSwift/libwebsockets,IOPOINT/libwebsockets,pombredanne/libwebsockets,tn0502/libwebsockets,GroundControl-Solutions/libwebsockets,maws/libwebsockets,JoakimSoderberg/libwebsockets,pankona/libwebsockets,peeracle/libwebsockets,peeracle/libwebsockets,sartura/libwebsockets,turbulenz/libwebsockets,wenqiwooo/syslog-libwebsockets,dumganhar/libwebsockets,SoapyMan/libwebsockets,GroundControl-Solutions/libwebsockets,ralight/libwebsockets,GroundControl-Solutions/libwebsockets,RobertoMalatesta/libwebsockets,GroundControl-Solutions/libwebsockets,sanyaade-teachings/libwebsockets,maws/libwebsockets,cambridgehackers/libwebsockets,pankona/libwebsockets,peeracle/libwebsockets,mushroomgithub/libwebsockets,pombredanne/libwebsockets,maws/libwebsockets,dumganhar/libwebsockets,dumganhar/libwebsockets,peeracle/libwebsockets,sanyaade-teachings/libwebsockets,Chilledheart/libwebsockets,PureSwift/libwebsockets,pombredanne/libwebsockets,turbulenz/libwebsockets,sanyaade-teachings/libwebsockets,JoakimSoderberg/libwebsockets,pankona/libwebsockets,JoakimSoderberg/libwebsockets,gameclosure/libwebsockets,sanyaade-teachings/libwebsockets,RobertoMalatesta/libwebsockets,jmillan/libwebsockets,wenqiwooo/syslog-libwebsockets,PureSwift/libwebsockets,cambridgehackers/libwebsockets,SoapyMan/libwebsockets,ralight/libwebsockets,JoakimSoderberg/libwebsockets,ralight/libwebsockets,sartura/libwebsockets,RobertoMalatesta/libwebsockets,ralight/libwebsockets,cambridgehackers/libwebsockets,turbulenz/libwebsockets,cambridgehackers/libwebsockets,gameclosure/libwebsockets,pombredanne/libwebsockets,maws/libwebsockets,sartura/libwebsockets,PureSwift/libwebsockets,mushroomgithub/libwebsockets,Chilledheart/libwebsockets,SoapyMan/libwebsockets,GroundControl-Solutions/libwebsockets,mushroomgithub/libwebsockets,wenqiwooo/syslog-libwebsockets,ralight/libwebsockets,gameclosure/libwebsockets,tn0502/libwebsockets,tn0502/libwebsockets,sartura/libwebsockets,Chilledheart/libwebsockets,peeracle/libwebsockets,IOPOINT/libwebsockets,wenqiwooo/syslog-libwebsockets,pankona/libwebsockets,PureSwift/libwebsockets,dumganhar/libwebsockets