net: dsa: tag_sja1105: do not open-code dsa_switch_for_each_port

Find the remaining iterators over dst->ports that only filter for the
ports belonging to a certain switch, and replace those with the
dsa_switch_for_each_port helper that we have now.
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/dsa/tag_sja1105.c

@@ -158,10 +158,7 @@ static u16 sja1105_xmit_tpid(struct dsa_port *dp)
 	 * we're sure about that). It may not be on this port though, so we
 	 * need to find it.
 	 */
-	list_for_each_entry(other_dp, &ds->dst->ports, list) {
-		if (other_dp->ds != ds)
-			continue;
-
+	dsa_switch_for_each_port(other_dp, ds) {
 		if (!other_dp->bridge_dev)
 			continue;