irqchip/mchp-eic: Fix return value check in mchp_eic_init()

In case of error, the function of_iomap() returns NULL pointer
not ERR_PTR(). The IS_ERR() test in the return value check
should be replaced with NULL test.

Reported-by: Hulk Robot <[email protected]>
Signed-off-by: Yang Yingliang <[email protected]>
Reviewed-by: Claudiu Beznea <[email protected]>
Signed-off-by: Marc Zyngier <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

Author: Yang Yingliang

drivers/irqchip/irq-mchp-eic.c

@@ -209,7 +209,7 @@ static int mchp_eic_init(struct device_node *node, struct device_node *parent)
 		return -ENOMEM;
 
 	eic->base = of_iomap(node, 0);
-	if (IS_ERR(eic->base)) {
+	if (!eic->base) {
 		ret = -ENOMEM;
 		goto free;
 	}