irqchip: omap-intc: remove unnecesary of_address_to_resource() call

of_iomap(), which is called from omap_init_irq_of(),
already takes care of making sure we have a valid
resource to deal with. Because of that, we can
safely remove our explicit call to of_address_to_resource().
Acked-by: Jason Cooper <jason@lakedaemon.net>
Signed-off-by: Felipe Balbi <balbi@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

drivers/irqchip/irq-omap-intc.c

@@ -362,7 +362,6 @@ void __init ti81xx_init_irq(void)
 static int __init intc_of_init(struct device_node *node,
 			     struct device_node *parent)
 {
-	struct resource res;
 	int ret;
 
 	omap_nr_pending = 3;
@@ -371,11 +370,6 @@ static int __init intc_of_init(struct device_node *node,
 	if (WARN_ON(!node))
 		return -ENODEV;
 
-	if (of_address_to_resource(node, 0, &res)) {
-		WARN(1, "unable to get intc registers\n");
-		return -EINVAL;
-	}
-
 	if (of_device_is_compatible(node, "ti,am33xx-intc")) {
 		omap_nr_irqs = 128;
 		omap_nr_pending = 4;