net: dsa: mv88e6xxx: use dsa_switch_for_each_port in mv88e6xxx_lag_sync_masks

Make the intent of the code more clear by using the dedicated helper for
iterating over the ports of a switch.
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/dsa/mv88e6xxx/chip.c

@@ -6280,8 +6280,8 @@ static int mv88e6xxx_lag_sync_masks(struct dsa_switch *ds)
 	ivec = BIT(mv88e6xxx_num_ports(chip)) - 1;
 
 	/* Disable all masks for ports that _are_ members of a LAG. */
-	list_for_each_entry(dp, &ds->dst->ports, list) {
-		if (!dp->lag_dev || dp->ds != ds)
+	dsa_switch_for_each_port(dp, ds) {
+		if (!dp->lag_dev)
 			continue;
 
 		ivec &= ~BIT(dp->index);