irqchip/loongson-htvec: Fix potential resource leak

In the function htvec_of_init(), system resource "parent_irq"
was not released in an error case. Thus add a jump target for
the completion of the desired exception handling.

Fixes: 818e915f ("irqchip: Add Loongson HyperTransport Vector support")
Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/1594087972-21715-4-git-send-email-yangtiezhu@loongson.cn

drivers/irqchip/irq-loongson-htvec.c

@@ -192,7 +192,7 @@ static int htvec_of_init(struct device_node *node,
 	if (!priv->htvec_domain) {
 		pr_err("Failed to create IRQ domain\n");
 		err = -ENOMEM;
-		goto iounmap_base;
+		goto irq_dispose;
 	}
 
 	htvec_reset(priv);
@@ -203,6 +203,9 @@ static int htvec_of_init(struct device_node *node,
 
 	return 0;
 
+irq_dispose:
+	for (; i > 0; i--)
+		irq_dispose_mapping(parent_irq[i - 1]);
 iounmap_base:
 	iounmap(priv->base);
 free_priv: