net: stmmac: remove set but unused mask in stmmac_ethtool_set_link_ksettings()

This was never used since the commit that added it - e58bb43f5e
("stmmac: initial support to manage pcs modes").

Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Reviewed-by: Simon Horman <simon.horman@corigine.com>
Link: https://lore.kernel.org/r/20230406125412.48790-1-vladimir.oltean@nxp.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/ethernet/stmicro/stmmac/stmmac_ethtool.c

@@ -393,19 +393,10 @@ stmmac_ethtool_set_link_ksettings(struct net_device *dev,
 
 	if (priv->hw->pcs & STMMAC_PCS_RGMII ||
 	    priv->hw->pcs & STMMAC_PCS_SGMII) {
-		u32 mask = ADVERTISED_Autoneg | ADVERTISED_Pause;
-
 		/* Only support ANE */
 		if (cmd->base.autoneg != AUTONEG_ENABLE)
 			return -EINVAL;
 
-		mask &= (ADVERTISED_1000baseT_Half |
-			ADVERTISED_1000baseT_Full |
-			ADVERTISED_100baseT_Half |
-			ADVERTISED_100baseT_Full |
-			ADVERTISED_10baseT_Half |
-			ADVERTISED_10baseT_Full);
-
 		mutex_lock(&priv->lock);
 		stmmac_pcs_ctrl_ane(priv, priv->ioaddr, 1, priv->hw->ps, 0);
 		mutex_unlock(&priv->lock);