unused code in devname

[Matthew Dillon]

: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)
    
    Yup, go ahead.

					-Matt
					Matthew Dillon 
					<dillon at xxxxxxxxxxxxx>