[sky2] Avoid unused variable warning in gcc 4.6

Reported-by: Ralph Giles <giles@thaumas.net>
Tested-by: Ralph Giles <giles@thaumas.net>
Signed-off-by: Michael Brown <mcb30@ipxe.org>

src/drivers/net/sky2.c

 
 	rmb();
 	do {
-		struct sky2_port *sky2;
 		struct sky2_status_le *le  = hw->st_le + hw->st_idx;
 		unsigned port;
 		struct net_device *dev;
 
 		port = le->css & CSS_LINK_BIT;
 		dev = hw->dev[port];
-		sky2 = netdev_priv(dev);
 		length = le16_to_cpu(le->length);
 		status = le32_to_cpu(le->status);
 
 	unsigned port = sky2->port;
 	u16 reg;
 	u8 filter[8];
-	int rx_pause;
-
-	rx_pause = (sky2->flow_status == FC_RX || sky2->flow_status == FC_BOTH);
 
 	reg = gma_read16(hw, port, GM_RX_CTRL);
 	reg |= GM_RXCR_UCF_ENA;