In ftgmac100_probe(), we should hold the refernece returned by
of_get_child_by_name() and use it to call of_node_put() for
reference balance.

Fixes: 39bfab88 ("net: ftgmac100: Add support for DT phy-handle property")
Signed-off-by: NLiang He <windhl@126.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>