ARM: amba: make irq 0 invalid

Fix core bus and MMCI such that irq 0 means that there is no IRQ
attached.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

drivers/amba/bus.c

@@ -564,9 +564,9 @@ int amba_device_add(struct amba_device *dev, struct resource *parent)
 	if (ret)
 		goto err_release;
 
-	if (dev->irq[0] != NO_IRQ)
+	if (dev->irq[0] && dev->irq[0] != NO_IRQ)
 		ret = device_create_file(&dev->dev, &dev_attr_irq0);
-	if (ret == 0 && dev->irq[1] != NO_IRQ)
+	if (ret == 0 && dev->irq[1] && dev->irq[1] != NO_IRQ)
 		ret = device_create_file(&dev->dev, &dev_attr_irq1);
 	if (ret == 0)
 		return ret;

drivers/mmc/host/mmci.c

@@ -1325,7 +1325,7 @@ static int __devinit mmci_probe(struct amba_device *dev,
 	if (ret)
 		goto unmap;
 
-	if (dev->irq[1] == NO_IRQ)
+	if (dev->irq[1] == NO_IRQ || !dev->irq[1])
 		host->singleirq = true;
 	else {
 		ret = request_irq(dev->irq[1], mmci_pio_irq, IRQF_SHARED,