net: dsa: mv88e6xxx: do not change STP state on port disabling

When disabling a port, that is not for the driver to decide what to
do with the STP state. This is already handled by the DSA layer.
Signed-off-by: Vivien Didelot <vivien.didelot@gmail.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/dsa/mv88e6xxx/chip.c

@@ -2291,9 +2291,6 @@ static void mv88e6xxx_port_disable(struct dsa_switch *ds, int port)
 
 	mv88e6xxx_reg_lock(chip);
 
-	if (mv88e6xxx_port_set_state(chip, port, BR_STATE_DISABLED))
-		dev_err(chip->dev, "failed to disable port\n");
-
 	if (chip->info->ops->serdes_irq_free)
 		chip->info->ops->serdes_irq_free(chip, port);