mlxsw: spectrum: remove set but not used variable 'autoneg_status'

Fixes gcc '-Wunused-but-set-variable' warning:

drivers/net/ethernet/mellanox/mlxsw/spectrum.c: In function 'mlxsw_sp_port_get_link_ksettings':
drivers/net/ethernet/mellanox/mlxsw/spectrum.c:3062:5: warning:
 variable 'autoneg_status' set but not used [-Wunused-but-set-variable]

It's not used since commit 475b33cb ("mlxsw: spectrum: Remove unsupported
eth_proto_lp_advertise field in PTYS")
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Reviewed-by: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/mellanox/mlxsw/spectrum.c

@@ -3059,7 +3059,6 @@ static int mlxsw_sp_port_get_link_ksettings(struct net_device *dev,
 	const struct mlxsw_sp_port_type_speed_ops *ops;
 	char ptys_pl[MLXSW_REG_PTYS_LEN];
 	u8 connector_type;
-	u8 autoneg_status;
 	bool autoneg;
 	int err;
 
@@ -3079,8 +3078,6 @@ static int mlxsw_sp_port_get_link_ksettings(struct net_device *dev,
 	mlxsw_sp_port_get_link_advertise(mlxsw_sp, eth_proto_admin, autoneg,
 					 cmd);
 
-	autoneg_status = mlxsw_reg_ptys_an_status_get(ptys_pl);
-
 	cmd->base.autoneg = autoneg ? AUTONEG_ENABLE : AUTONEG_DISABLE;
 	connector_type = mlxsw_reg_ptys_connector_type_get(ptys_pl);
 	cmd->base.port = mlxsw_sp_port_connector_port(connector_type);