s2io: Fixing debug message

Currently s2io is dumping debug messages using the interface name
before it was allocated, showing a message like the following:

s2io: eth%d: Ring Mem PHY: 0x7ef80000
s2io: s2io_reset: Resetting XFrame card eth%d

This patch just fixes it, printing the pci bus information for
the card instead of the interface name.

Signed-off-by: Breno Leitao <leitao@linux.vnet.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>