only call em_init() when IFF_UP is set, not unconditional.

prevents another round of autonegotiation (and thus, few seconds outage)
with every address change that had to be reintroduced a few revs ago
because of the watchdog timeout problems people were seeing.
this gives the benifit from both with the problems of neither ;)
tested by daniel polak on a system that saw the watchdog timeouts before
ok theo

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