sys/lock.h: Need <sys/systm.h> for nullop.
But only do that we're not using SPINLOCK_BACKOFF_HOOK from <machine/lock.h>.
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/* $NetBSD: lock.h,v 1.91 2020/12/22 01:58:58 ad Exp $ */
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/* $NetBSD: lock.h,v 1.92 2022/07/24 20:28:39 riastradh Exp $ */
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/*-
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* Copyright (c) 1999, 2000, 2006, 2007 The NetBSD Foundation, Inc.
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#define SPINLOCK_SPIN_HOOK
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#endif
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#ifndef SPINLOCK_BACKOFF_HOOK
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#include <sys/systm.h>
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#define SPINLOCK_BACKOFF_HOOK nullop(NULL)
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#endif
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#ifndef SPINLOCK_BACKOFF_MIN
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