irqchip/aslint-sswi: Fix error check of of_io_request_and_map() result

of_io_request_and_map() returns IOMEM_ERR_PTR() on failure which is
non-NULL.

Fixes: 8a7f030 ("irqchip/aslint-sswi: Request IO memory resource")
Reported-by: Chris Mason <clm@meta.com>
Signed-off-by: Vladimir Kondratiev <vladimir.kondratiev@mobileye.com>
Signed-off-by: Thomas Gleixner <tglx@kernel.org>
Link: https://patch.msgid.link/20260118082843.2786630-1-vladimir.kondratiev@mobileye.com
Closes: https://lore.kernel.org/all/20260116124257.78357-1-clm@meta.com

Author: vlkondratiev

drivers/irqchip/irq-aclint-sswi.c

@@ -110,8 +110,10 @@ static int __init aclint_sswi_probe(struct fwnode_handle *fwnode)
 		return -EINVAL;
 
 	reg = of_io_request_and_map(to_of_node(fwnode), 0, NULL);
-	if (!reg)
-		return -ENOMEM;
+	if (IS_ERR(reg)) {
+		pr_err("%pfwP: Failed to map MMIO region\n", fwnode);
+		return PTR_ERR(reg);
+	}
 
 	/* Parse SSWI setting */
 	rc = aclint_sswi_parse_irq(fwnode, reg);