Fixes for POSIX pollq structure.

It was possible for pollq arm to be called on a node that was removed
in some circumstances -- particularly and ep that was closed in the
callback.

While here, lets use normal booleans for closed state, and only call
the arm function (which is not free -- typicall it involves a mutex
and may even involve a system call) if we are going to arm some events.

We also initialize these things properly, and clean up a stale comment.

This work is done to faciliate the kqueue work by @liamstask.

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