[BRIDGE]: Fix warning in net-2.6.22

The following is leftover from earlier change in net-2.6.22.
Signed-off-by: NStephen Hemminger <shemminger@linux-foundation.org>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

net/bridge/br_device.c

@@ -88,7 +88,6 @@ static int br_set_mac_address(struct net_device *dev, void *p)
 {
 	struct net_bridge *br = netdev_priv(dev);
 	struct sockaddr *addr = p;
-	struct net_bridge_port *port;
 
 	if (!is_valid_ether_addr(addr->sa_data))
 		return -EINVAL;