net: dsa: Add missing of_node_put() in dsa_port_link_register_of

net: dsa: Add missing of_node_put() in dsa_port_link_register_of

[ Upstream commit 999c12eb8d85717e42dba8cdbedc6a63a99206c1 ]

The device_node pointer is returned by of_parse_phandle()  with refcount
incremented. We should use of_node_put() on it when done.
of_node_put() will check for NULL value.

Fixes: e2043043856d ("net: dsa: Don't instantiate phylink for CPU/DSA ports unless needed")
Signed-off-by: Miaoqian Lin <linmq006@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>