irqchip/gic-v3-its: Prevent double free on error

The error handling path in its_vpe_irq_domain_alloc() causes a double free
when its_vpe_init() fails after successfully allocating at least one
interrupt. This happens because its_vpe_irq_domain_free() frees the
interrupts along with the area bitmap and the vprop_page and
its_vpe_irq_domain_alloc() subsequently frees the area bitmap and the
vprop_page again.

Fix this by unconditionally invoking its_vpe_irq_domain_free() which
handles all cases correctly and by removing the bitmap/vprop_page freeing
from its_vpe_irq_domain_alloc().

[ tglx: Massaged change log ]

Fixes: 7d75bbb4 ("irqchip/gic-v3-its: Add VPE irq domain allocation/teardown")
Signed-off-by: Guanrui Huang <guanrui.huang@linux.alibaba.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Marc Zyngier <maz@kernel.org>
Reviewed-by: Zenghui Yu <yuzenghui@huawei.com>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20240418061053.96803-2-guanrui.huang@linux.alibaba.com

drivers/irqchip/irq-gic-v3-its.c

@@ -4567,14 +4567,9 @@ static int its_vpe_irq_domain_alloc(struct irq_domain *domain, unsigned int virq
 		irqd_set_resend_when_in_progress(irq_get_irq_data(virq + i));
 	}
 
-	if (err) {
-		if (i > 0)
+	if (err)
 		its_vpe_irq_domain_free(domain, virq, i);
 
-		its_lpi_free(bitmap, base, nr_ids);
-		its_free_prop_table(vprop_page);
-	}
-
 	return err;
 }