ixgbe: Return success or failure on VF MAC filter set

When setting a MAC filter for the VF the function should return a success
or failure code, not the index of the new filter.  It causes spurious NACK
returns to the VF driver.

Signed-off-by: Greg Rose <gregory.v.rose@intel.com>
Tested-by: Phil Schmitt <phillip.j.schmitt@intel.com>
Tested-by: Sibai Li <sibai.li@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

drivers/net/ethernet/intel/ixgbe/ixgbe_sriov.c

@@ -675,7 +675,7 @@ static int ixgbe_set_vf_mac_addr(struct ixgbe_adapter *adapter,
 		return -1;
 	}
 
-	return ixgbe_set_vf_mac(adapter, vf, new_mac);
+	return ixgbe_set_vf_mac(adapter, vf, new_mac) < 0;
 }
 
 static int ixgbe_set_vf_vlan_msg(struct ixgbe_adapter *adapter,