Add OF_xref_from_device() so that there's no need to have an intermediate
call to ofw_bus_get_node() to lookup info that's already in the xreflist.


git-svn-id: svn+ssh://svn.freebsd.org/base/head@270958 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f
Use OF_xref_from_device(), not OF_xref_from_node().  Also, use bzero()
rather than memset().


git-svn-id: svn+ssh://svn.freebsd.org/base/head@270959 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f
Fix typo.

Pointy hat:	ian


git-svn-id: svn+ssh://svn.freebsd.org/base/head@270960 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f