PVS-Studio warning V560 for ReactOS

void adns__querysend_tcp(adns_query qu, struct timeval now) {
  ...
  if (!(errno == EAGAIN || EWOULDBLOCK ||
        errno == EINTR || errno == ENOSPC ||
        errno == ENOBUFS || errno == ENOMEM)) {
  ...
}

A comparison is missing. This is what should have been written here: ... || errno == EWOULDBLOCK || ...

This suspicious code was found in ReactOS project by PVS-Studio static code analyzer.
Warning message is:
V560 A part of conditional expression is always true: 10035L. adns transmit.c 203

PVS-Studio is a static analyzer for detecting bugs in the source code of applications written in C, C++, C++11, C++/CX. Site: http://www.viva64.com/en/pvs-studio/