i40e: Make it clear a parameter is never used

Flag the filter_mask parameter as __always_unused in the
ndo_bridge_getlink function.

Change-ID: Ifc1e99c7fb84bcbf81cf7b0ac891ad8ca956ffb2
Signed-off-by: Carolyn Wyborny <carolyn.wyborny@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

drivers/net/ethernet/intel/i40e/i40e_main.c

@@ -8336,7 +8336,8 @@ static int i40e_ndo_bridge_setlink(struct net_device *dev,
  **/
 static int i40e_ndo_bridge_getlink(struct sk_buff *skb, u32 pid, u32 seq,
 				   struct net_device *dev,
-				   u32 filter_mask, int nlflags)
+				   u32 __always_unused filter_mask,
+				   int nlflags)
 {
 	struct i40e_netdev_priv *np = netdev_priv(dev);
 	struct i40e_vsi *vsi = np->vsi;