Fix a bug in MAKEDEV -- when creating /dev/usb, the code was using whatever random value was already in $unit. It happened to work because the variable is often unset, but this is not always the case e.g. when you call "MAKEDEV sio2 usb ..."
Fix a bug in MAKEDEV -- when creating /dev/usb, the code was using
whatever random value was already in $unit. It happened to work
because the variable is often unset, but this is not always the
case e.g. when you call "MAKEDEV sio2 usb ..."

This affects -stable as well.

Reviewed by: n_hibma
Silence from: re
MFC after: 3 days

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