net: dsa: mv88e6xxx: fix unreleased fwnode_handle in setup_port()

'ports_fwnode' is initialized via device_get_named_child_node(), which
requires a call to fwnode_handle_put() when the variable is no longer
required to avoid leaking memory.

Add the missing fwnode_handle_put() after 'ports_fwnode' has been used
and is no longer required.

Fixes: 94a2a84 ("net: dsa: mv88e6xxx: Support LED control")
Signed-off-by: Javier Carrasco <javier.carrasco.cruz@gmail.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/dsa/mv88e6xxx/chip.c

@@ -3379,6 +3379,7 @@ static int mv88e6xxx_setup_port(struct mv88e6xxx_chip *chip, int port)
 				break;
 			}
 		}
+		fwnode_handle_put(ports_fwnode);
 	} else {
 		dev_dbg(chip->dev, "no ethernet ports node defined for the device\n");
 	}