powerpc/powermac/low_i2c: Add missing of_node_put() in kw_i2c_probe()

Call of_node_put() for the reference 'parent' returned by
of_get_parent() which has increased the refcount.
Signed-off-by: Liang He <windhl@126.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20220716070758.539434-1-windhl@126.com

arch/powerpc/platforms/powermac/low_i2c.c

@@ -627,6 +627,7 @@ static void __init kw_i2c_probe(void)
 			if (parent == NULL)
 				continue;
 			chans = parent->name[0] == 'u' ? 2 : 1;
+			of_node_put(parent);
 			for (i = 0; i < chans; i++)
 				kw_i2c_add(host, np, np, i);
 		} else {