irqchip/gic-v5: Fix error handling in gicv5_its_irq_domain_alloc()

Code in gicv5_its_irq_domain_alloc() has two issues:

 - it checks the wrong return value/variable when calling gicv5_alloc_lpi()

 - The cleanup code does not take previous loop iterations into account

Fix both issues at once by adding the right gicv5_alloc_lpi() variable
check and by reworking the function cleanup code to take into account
current and previous iterations.

[ lpieralisi: Reworded commit message ]

Fixes: 57d7219 ("irqchip/gic-v5: Add GICv5 ITS support")
Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>
Signed-off-by: Lorenzo Pieralisi <lpieralisi@kernel.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Zenghui Yu <yuzenghui@huawei.com>
Link: https://lore.kernel.org/all/20250908082745.113718-4-lpieralisi@kernel.org

Author: Dan Carpenter

drivers/irqchip/irq-gic-v5-its.c

@@ -947,15 +947,18 @@ static int gicv5_its_irq_domain_alloc(struct irq_domain *domain, unsigned int vi
 	device_id = its_dev->device_id;
 
 	for (i = 0; i < nr_irqs; i++) {
-		lpi = gicv5_alloc_lpi();
+		ret = gicv5_alloc_lpi();
 		if (ret < 0) {
 			pr_debug("Failed to find free LPI!\n");
-			goto out_eventid;
+			goto out_free_irqs;
 		}
+		lpi = ret;
 
 		ret = irq_domain_alloc_irqs_parent(domain, virq + i, 1, &lpi);
-		if (ret)
-			goto out_free_lpi;
+		if (ret) {
+			gicv5_free_lpi(lpi);
+			goto out_free_irqs;
+		}
 
 		/*
 		 * Store eventid and deviceid into the hwirq for later use.
@@ -975,8 +978,13 @@ static int gicv5_its_irq_domain_alloc(struct irq_domain *domain, unsigned int vi
 
 	return 0;
 
-out_free_lpi:
-	gicv5_free_lpi(lpi);
+out_free_irqs:
+	while (--i >= 0) {
+		irqd = irq_domain_get_irq_data(domain, virq + i);
+		gicv5_free_lpi(irqd->parent_data->hwirq);
+		irq_domain_reset_irq_data(irqd);
+		irq_domain_free_irqs_parent(domain, virq + i, 1);
+	}
 out_eventid:
 	gicv5_its_free_eventid(its_dev, event_id_base, nr_irqs);
 	return ret;