'sysctl dev', round two

[M. Warner Losh]

In message: <xzp8yiophgn.fsf at dwp.des.no>
            des at des.no (Dag-Erling Smørgrav) writes:
:  - unattached devices still aren't picked up, which they should if
:    they have a device_t.  For instance, I don't see a sysctl entry for
:    the following:

This is because you are basing things on attach, not a node being
parented to the tree.  I have some ideas on how to deal.

Warner