net: dsa: hellcreek: refactor hellcreek_port_setup_tc() to use switch/case

The following patch will need to make this function also respond to
TC_QUERY_BASE, so make the processing more structured around the
tc_setup_type.
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Reviewed-by: Kurt Kanzenbach <kurt@linutronix.de>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/dsa/hirschmann/hellcreek.c

@@ -1812,19 +1812,23 @@ static bool hellcreek_validate_schedule(struct hellcreek *hellcreek,
 static int hellcreek_port_setup_tc(struct dsa_switch *ds, int port,
 				   enum tc_setup_type type, void *type_data)
 {
-	struct tc_taprio_qopt_offload *taprio = type_data;
 	struct hellcreek *hellcreek = ds->priv;
 
-	if (type != TC_SETUP_QDISC_TAPRIO)
-		return -EOPNOTSUPP;
+	switch (type) {
+	case TC_SETUP_QDISC_TAPRIO: {
+		struct tc_taprio_qopt_offload *taprio = type_data;
 
-	if (!hellcreek_validate_schedule(hellcreek, taprio))
-		return -EOPNOTSUPP;
+		if (!hellcreek_validate_schedule(hellcreek, taprio))
+			return -EOPNOTSUPP;
 
-	if (taprio->enable)
-		return hellcreek_port_set_schedule(ds, port, taprio);
+		if (taprio->enable)
+			return hellcreek_port_set_schedule(ds, port, taprio);
 
-	return hellcreek_port_del_schedule(ds, port);
+		return hellcreek_port_del_schedule(ds, port);
+	}
+	default:
+		return -EOPNOTSUPP;
+	}
 }
 
 static const struct dsa_switch_ops hellcreek_ds_ops = {