irqchip/loongson-pch-msi: Fix off-by-one on allocation error path

[ Upstream commit b327708798809328f21da8dc14cc8883d1e8a4b3 ]

When pch_msi_parent_domain_alloc() returns an error, there is an off-by-one
in the number of interrupts to be freed.

Fix it by passing the number of successfully allocated interrupts, instead of the
relative index of the last allocated one.

Fixes: 632dcc2c75 ("irqchip: Add Loongson PCH MSI controller")
Signed-off-by: Zenghui Yu <yuzenghui@huawei.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Jiaxun Yang <jiaxun.yang@flygoat.com>
Link: https://lore.kernel.org/r/20240327142334.1098-1-yuzenghui@huawei.com
Signed-off-by: Sasha Levin <sashal@kernel.org>

drivers/irqchip/irq-loongson-pch-msi.c

@@ -132,7 +132,7 @@ static int pch_msi_middle_domain_alloc(struct irq_domain *domain,
 
 err_hwirq:
 	pch_msi_free_hwirq(priv, hwirq, nr_irqs);
-	irq_domain_free_irqs_parent(domain, virq, i - 1);
+	irq_domain_free_irqs_parent(domain, virq, i);
 
 	return err;
 }