irqchip/aspeed-scu-ic: Fix an IS_ERR() vs NULL check

of_iomap() doesn't return error pointers, it returns NULL.  Fix the error
checking to check for NULL pointers.

Fixes: 86cd430 ("irqchip/aspeed-scu-ic: Refactor driver to support variant-based initialization")
Signed-off-by: Dan Carpenter <[email protected]>
Signed-off-by: Thomas Gleixner <[email protected]>

Author: Dan Carpenter

drivers/irqchip/irq-aspeed-scu-ic.c

@@ -215,8 +215,8 @@ static int aspeed_scu_ic_of_init_common(struct aspeed_scu_ic *scu_ic,
 	int irq, rc = 0;
 
 	scu_ic->base = of_iomap(node, 0);
-	if (IS_ERR(scu_ic->base)) {
-		rc = PTR_ERR(scu_ic->base);
+	if (!scu_ic->base) {
+		rc = -ENOMEM;
 		goto err;
 	}