Add a stub man page for device_get_sysctl{_ctx,tree}. Needs some

work, but is better than nothing.  Any help appreciated.

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+.\" -*- nroff -*-
+.\"
+.\" Copyright (c) 2006 M. Warner Losh
+.\"
+.\" All rights reserved.
+.\"
+.\" This program is free software.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY EXPRESS OR
+.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+.\" IN NO EVENT SHALL THE DEVELOPERS BE LIABLE FOR ANY DIRECT, INDIRECT,
+.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+.\"
+.\" $FreeBSD$
+.\"
+.Dd May 23, 2006
+.Dt DEVICE_GET_SYSCTL 9
+.Os
+.Sh NAME
+.Nm device_get_sysctl_ctx ,
+.Nm device_get_sysctl_tree
+.Nd Manipulate the sysctl oid tree for driver specific sysctl nodes.
+.Sh SYNOPSIS
+.In sys/param.h
+.In sys/bus.h
+.Ft struct sysctl_ctx_list *
+.Fn device_get_sysctl_ctx "device_t dev"
+.Ft struct sysctl_oid *
+.Fn device_get_sysctl_tree "device_t dev"
+.Sh DESCRIPTION
+The newbus system automatically adds a sysctl node for each device
+in the system.
+This node can be accessed with the
+.Fn device_get_sysctl_tree
+ function.
+The context for the node can be obtained with the
+.Fn device_get_sysctl_ctl 
+function.
+.Sh SEE ALSO
+.Xr device 9
+.Sh AUTHORS
+This manual page was written by
+.An Warner Losh .