Hide many debug printfs behind DPRINTF, and remove most others.  Remove some stray bits of code, and properly clear the Rx queue upon link state changes.
Hide many debug printfs behind DPRINTF, and remove most others.  Remove some
stray bits of code, and properly clear the Rx queue upon link state changes.

orumin/openbsd-efivars,orumin/openbsd-efivars,orumin/openbsd-efivars,orumin/openbsd-efivars