tulip: fix setting device address from rom

I missed removing i from the array index when converting
from a loop to a direct copy.

Fixes: ca879317

 ("ethernet: tulip: remove direct netdev->dev_addr writes")
Reported-by: Joe Perches <joe@perches.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>