powerpc/powermac/pfunc_base: Add missing of_node_put() in macio_gpio_init_one()

Call of_node_put() for the reference 'gparent' escaped out of the
previous for_each_child_of_node() as it has increased the refcount.

Signed-off-by: Liang He <[e-mail]>
Signed-off-by: Michael Ellerman <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]

arch/powerpc/platforms/powermac/pfunc_base.c

···
 	for_each_child_of_node(gparent, gp)
 		pmf_do_functions(gp, NULL, 0, PMF_FLAGS_ON_INIT, NULL);
 
+	of_node_put(gparent);
+
 	/* Note: We do not at this point implement the "at sleep" or "at wake"
 	 * functions. I yet to find any for GPIOs anyway
 	 */