ethernet: tulip: avoid duplicate variable name on sparc

I recently added a variable called addr to tulip_init_one()
but for sparc there's already a variable called that half
way thru the function. Rename it to fix build.

Fixes: ca879317 ("ethernet: tulip: remove direct netdev->dev_addr writes")
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>