server.c: test **truncated_send_len** for partial
server.c: test **truncated_send_len** for partial

Testing against truncated_send_malloc won't work if we've already
buffered and completed a partial buffer, as truncated_send_malloc
isn't free'd until the socket is destroyed.

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