net: dsa: felix: don't deinitialize unused ports

ocelot_init_port is called only if dsa_is_unused_port == false, however
ocelot_deinit_port is called unconditionally. This causes a warning in
the skb_queue_purge inside ocelot_deinit_port saying that the spin lock
protecting ocelot_port->tx_skbs was not initialized.

Fixes: e5fb512d81 ("net: mscc: ocelot: deinitialize only initialized ports")
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/dsa/ocelot/felix.c

@@ -1262,8 +1262,12 @@ static void felix_teardown(struct dsa_switch *ds)
 	ocelot_deinit_timestamp(ocelot);
 	ocelot_deinit(ocelot);
 
-	for (port = 0; port < ocelot->num_phys_ports; port++)
+	for (port = 0; port < ocelot->num_phys_ports; port++) {
+		if (dsa_is_unused_port(ds, port))
+			continue;
+
 		ocelot_deinit_port(ocelot, port);
+	}
 
 	if (felix->info->mdio_bus_free)
 		felix->info->mdio_bus_free(ocelot);