af_unix: do not report POLLOUT on listeners
poll(POLLOUT) on a listener should not report fd is ready for a write(). This would break some applications using poll() and pfd.events = -1, as they would not block in poll() Signed-off-by: Eric Dumazet <edumazet@google.com> Reported-by: Alan Burlison <Alan.Burlison@oracle.com> Tested-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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