fwctl_fetch: Add a comment describing the tool.
I meant to include this in the earlier commit adding fwctl_fetch but forgot to amend the commit before pushing it.
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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/*
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* Fetch the value of fwctl nodes from a guest.
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*
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* Usage: fwctl_fetch <node>
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*/
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#include <sys/param.h>
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#include <err.h>
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#include <fcntl.h>
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