sfc: Remove unused field left from mis-merge

Commit eedc765c merged changes from
net-2.6 that added and then removed efx_nic::port_num, which was also
added in net-next-2.6.  The end result should be that it is removed,
since it is now unused.
Signed-off-by: NBen Hutchings <bhutchings@solarflare.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/sfc/net_driver.h

@@ -622,7 +622,6 @@ union efx_multicast_hash {
  * struct efx_nic - an Efx NIC
  * @name: Device name (net device name or bus id before net device registered)
  * @pci_dev: The PCI device
- * @port_num: Index of this host port within the controller
  * @type: Controller type attributes
  * @legacy_irq: IRQ number
  * @workqueue: Workqueue for port reconfigures and the HW monitor.
@@ -708,7 +707,6 @@ union efx_multicast_hash {
 struct efx_nic {
 	char name[IFNAMSIZ];
 	struct pci_dev *pci_dev;
-	unsigned port_num;
 	const struct efx_nic_type *type;
 	int legacy_irq;
 	struct workqueue_struct *workqueue;