powerpc/85xx: Add missing of_node_put() in ksi8560.c

In ksi8560_setup_arch(), of_find_compatible_node() will return a
node pointer with refcount incremented. The reference should be dropped
with of_node_put() when it is not used anymore.
Signed-off-by: Liang He <windhl@126.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20220616132922.3987053-1-windhl@126.com

arch/powerpc/platforms/85xx/ksi8560.c

@@ -133,6 +133,8 @@ static void __init ksi8560_setup_arch(void)
 	else
 		printk(KERN_ERR "Can't find CPLD in device tree\n");
 
+	of_node_put(cpld);
+
 	if (ppc_md.progress)
 		ppc_md.progress("ksi8560_setup_arch()", 0);