irqchip/nvic: Release nvic_base upon failure

smatch warning was reported as below ->

smatch warnings:
drivers/irqchip/irq-nvic.c:131 nvic_of_init()
warn: 'nvic_base' not released on lines: 97.

Release nvic_base upon failure.
Reported-by: Nkernel test robot <lkp@intel.com>
Reported-by: NDan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: NSouptick Joarder (HPE) <jrdr.linux@gmail.com>
Signed-off-by: NMarc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20220218163303.33344-1-jrdr.linux@gmail.com

drivers/irqchip/irq-nvic.c

@@ -107,6 +107,7 @@ static int __init nvic_of_init(struct device_node *node,
 
 	if (!nvic_irq_domain) {
 		pr_warn("Failed to allocate irq domain\n");
+		iounmap(nvic_base);
 		return -ENOMEM;
 	}
 
@@ -116,6 +117,7 @@ static int __init nvic_of_init(struct device_node *node,
 	if (ret) {
 		pr_warn("Failed to allocate irq chips\n");
 		irq_domain_remove(nvic_irq_domain);
+		iounmap(nvic_base);
 		return ret;
 	}