call zmq_errno as soon as possible
call zmq_errno as soon as possible

avoids errno being clobbered by other operations before it's retrieved

yyt030/pyzmq,dash-dash/pyzmq,yyt030/pyzmq,caidongyun/pyzmq,Mustard-Systems-Ltd/pyzmq,Mustard-Systems-Ltd/pyzmq,ArvinPan/pyzmq,Mustard-Systems-Ltd/pyzmq,swn1/pyzmq,caidongyun/pyzmq,ArvinPan/pyzmq,dash-dash/pyzmq,yyt030/pyzmq,swn1/pyzmq,ArvinPan/pyzmq,dash-dash/pyzmq,caidongyun/pyzmq,swn1/pyzmq