igb: remove disable_av variable from mac_info struct

The disable_av variable is never used by the driver and provides no value as
it is likely a leftover debugging variable.  I have removed it and replaced
the one spot that checked for it with a check for a valid address.
Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/igb/e1000_hw.h

@@ -484,7 +484,6 @@ struct e1000_mac_info {
 	bool asf_firmware_present;
 	bool autoneg;
 	bool autoneg_failed;
-	bool disable_av;
 	bool disable_hw_init_bits;
 	bool get_link_status;
 	bool ifs_params_forced;

drivers/net/igb/e1000_mac.c

@@ -200,7 +200,8 @@ void igb_rar_set(struct e1000_hw *hw, u8 *addr, u32 index)
 
 	rar_high = ((u32) addr[4] | ((u32) addr[5] << 8));
 
-	if (!hw->mac.disable_av)
+	/* If MAC address zero, no need to set the AV bit */
+	if (rar_low || rar_high)
 		rar_high |= E1000_RAH_AV;
 
 	wr32(E1000_RAL(index), rar_low);