[Bug 278826] [hpet] cdev->si_refcount leakage when enable hpet as timecounter hardware

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=278826

--- Comment #3 from Konstantin Belousov <kib@FreeBSD.org> ---
No, si_refcount is not a reference existing during the mapping lifetime.
The si_refcount is the transient refcount taken while a kernel thread operates
on the cdev.  For instance, in case of d_mmap, it is taken by dev_refthread()
in old_dev_pager_fault() around the call to csw->d_mmap, and released by the
nearby call(s) to dev_relthread().

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