powerpc/44x: Add of_node_put() when break out from for_each

In ppc47x_init_irq(), we need to call of_node_put() when there is
a break during the iteration of for_each_node_with_property() which
will automatically increase and decrease the refcount.
Signed-off-by: Liang He <windhl@126.com>
[mpe: mpic_alloc() takes its own reference]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20220701133126.243102-1-windhl@126.com

arch/powerpc/platforms/44x/ppc476.c

@@ -140,6 +140,8 @@ static void __init ppc47x_init_irq(void)
 		ppc_md.get_irq = mpic_get_irq;
 	} else
 		panic("Unrecognized top level interrupt controller");
+
+	of_node_put(np);
 }
 
 #ifdef CONFIG_SMP