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

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

--- Comment #6 from Austin Zhang <austin.zhang@dell.com> ---
(In reply to Konstantin Belousov from comment #5)

will you also check si_refcount? I believe si_threadcount is correct but
si_refcount is not.

below is my dtrace output:
[root@freebsd-main ~]# dtrace -n 'fbt::dev_ref:entry {printf("[%s]: invoke
dev_ref: %s, refcount:%d threadcount:%d", execname, args[0]->si_name,
args[0]->si_refcount, args[0]->si_threadcount)}'
dtrace: description 'fbt::dev_ref:entry ' matched 1 probe
CPU     ID                    FUNCTION:NAME
  1  43845                    dev_ref:entry [uname]: invoke dev_ref: hpet0,
refcount:42494 threadcount:2
  1  43845                    dev_ref:entry [sh]: invoke dev_ref: hpet0,
refcount:42495 threadcount:2
  1  43845                    dev_ref:entry [atrun]: invoke dev_ref: hpet0,
refcount:42496 threadcount:2

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