usb: typec: tcpci: fix of node refcount leak in tcpci_register_port()

In the Linux kernel, the following vulnerability has been resolved:

usb: typec: tcpci: fix of node refcount leak in tcpci_register_port()

I got the following report while doing device(mt6370-tcpc) load

test with CONFIG_OF_UNITTEST and CONFIG_OF_DYNAMIC enabled:

OF: ERROR: memory leak, expected refcount 1 instead of 2,

of_node_get()/of_node_put() unbalanced - destroy cset entry:

attach overlay node /i2c/pmic@34/tcpc/connector

The 'fwnode' set in tcpci_parse_config() which is called

in tcpci_register_port(), its node refcount is increased

in device_get_named_child_node(). It needs be put while

exiting, so call fwnode_handle_put() in the error path of

tcpci_register_port() and in tcpci_unregister_port() to

avoid leak.