Comment 9 for bug 1760729

@Daniel, unsure that commit fixes it?
(https://gitlab.freedesktop.org/pulseaudio/pulseaudio/commit/4762aa45 for reference/easier browsing)

The commit message states
'The bug had no impact because there is only one caller of pa_make_fd_block() in poll-win32.c'

Also the code bt here indicagtes it assert on
  194: pa_assert_se((v = fcntl(fd, F_GETFL)) >= 0);

where the code change from that commit is a few lines further in the function