matching instance rather than the last one. this restores the behaviour
in the multiple-match case to what it was when all the drivers only allowed
instance 0 (and in particular, makes autonegotiation of the on-board fxp
on my DK440LX board work again by default, which has two PHYs that both
advertise "auto"). as discussed on tech-net.
select the current medium, (and it is not autoselect), assume no change and
do not try to select the medium. Fixes 'ifconfig le0 medium 10base5' on sparc2
without requiring a 'do nothing' mediachange callback.
Jonathan Stone and myself. Many thanks to Matt Thomas for providing
the information necessary to implement this interface, and for helping
to shake out the bugs.