thunderbolt: Make usb4_switch_map_usb3_down() also return enabled ports

We need to call this on enabled ports in order to find the mapping from
host router USB4 port to a USB 3.x downstream adapter, so make the
function return enabled ports as well.

While there fix parameter alignment in tb_find_usb3_down().
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>

drivers/thunderbolt/tb.c

@@ -206,22 +206,14 @@ static struct tb_port *tb_find_unused_port(struct tb_switch *sw,
 }
 
 static struct tb_port *tb_find_usb3_down(struct tb_switch *sw,
-					const struct tb_port *port)
+					 const struct tb_port *port)
 {
 	struct tb_port *down;
 
 	down = usb4_switch_map_usb3_down(sw, port);
-	if (down) {
-		if (WARN_ON(!tb_port_is_usb3_down(down)))
-			goto out;
-		if (WARN_ON(tb_usb3_port_is_enabled(down)))
-			goto out;
-
+	if (down && !tb_usb3_port_is_enabled(down))
 		return down;
-	}
-
-out:
-	return tb_find_unused_port(sw, TB_TYPE_USB3_DOWN);
+	return NULL;
 }
 
 static int tb_tunnel_usb3(struct tb *tb, struct tb_switch *sw)

drivers/thunderbolt/usb4.c

@@ -759,7 +759,7 @@ struct tb_port *usb4_switch_map_usb3_down(struct tb_switch *sw,
 		if (!tb_port_is_usb3_down(p))
 			continue;
 
-		if (usb_idx == usb4_idx && !tb_usb3_port_is_enabled(p))
+		if (usb_idx == usb4_idx)
 			return p;
 
 		usb_idx++;