K 10
svn:author
V 4
wulf
K 8
svn:date
V 27
2019-11-24T20:47:40.268285Z
K 7
svn:log
V 388
Linux epoll: Register events with zero event mask

Such an events are legal and should be interpreted as EPOLLERR | EPOLLHUP.
Register a disabled kqueue event in that case as we do not support EPOLLHUP yet.

Required by Linux Steam client.

PR:		240590
Reported by:	Alex S <iwtcex@gmail.com>
Reviewed by:	emaste
MFC after:	1 week
Differential Revision:	https://reviews.freebsd.org/D22516

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