iommu/intel: Fix memleak in intel_irq_remapping_alloc

When irq_domain_get_irq_data() or irqd_cfg() fails
at i == 0, data allocated by kzalloc() has not been
freed before returning, which leads to memleak.

Fixes: b106ee63 ("irq_remapping/vt-d: Enhance Intel IR driver to support hierarchical irqdomains")
Signed-off-by: Dinghao Liu <dinghao.liu@zju.edu.cn>
Acked-by: Lu Baolu <baolu.lu@linux.intel.com>
Link: https://lore.kernel.org/r/20210105051837.32118-1-dinghao.liu@zju.edu.cnSigned-off-by: Will Deacon <will@kernel.org>

drivers/iommu/intel/irq_remapping.c

@@ -1353,6 +1353,8 @@ static int intel_irq_remapping_alloc(struct irq_domain *domain,
 		irq_data = irq_domain_get_irq_data(domain, virq + i);
 		irq_cfg = irqd_cfg(irq_data);
 		if (!irq_data || !irq_cfg) {
+			if (!i)
+				kfree(data);
 			ret = -EINVAL;
 			goto out_free_data;
 		}