unused code in devname

[Eirik Nygaard <eirikn@xxxxxxxxxxxx>]

The devname(3) function has some dead code, it can not succeed in getting
the device name from the kern.devname systctl because that sysctl does not
exist. So I wonder if we should remove the code entirely, or just #if 0 it
away
(http://eirikn.kerneled.com/dragonfly/devname-comment-unused-code.diff)

-- 
Eirik Nygaard
eirikn@xxxxxxxxxxxx

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