Don't rely on vp->v_usecount to tell when we can dispose of our resources

in fifo_close().  If the FIFO is accessed via a layed fs (e.g. nullfs),
v_usecount will always be 1.  Instead, just check fip->if_readers and
fip->fi_writers.  If either one is non-zero we know the FIFO is in use
and we should not free up its resources.  Adapted from FreeBSD, NetBSD
has an equivalent change (but they keep a counter instead).

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