replace 3 separate calls to WSAGetLastError() with 1

src/netbase.cpp

@@ -337,8 +337,9 @@ bool static ConnectSocketDirectly(const CService &addrConnect, SOCKET& hSocketRe
 
     if (connect(hSocket, (struct sockaddr*)&sockaddr, len) == SOCKET_ERROR)
     {
+        int nErr = WSAGetLastError();
         // WSAEINVAL is here because some legacy version of winsock uses it
-        if (WSAGetLastError() == WSAEINPROGRESS || WSAGetLastError() == WSAEWOULDBLOCK || WSAGetLastError() == WSAEINVAL)
+        if (nErr == WSAEINPROGRESS || nErr == WSAEWOULDBLOCK || nErr == WSAEINVAL)
         {
             struct timeval timeout;
             timeout.tv_sec  = nTimeout / 1000;