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>
diff --git a/drivers/amba/bus.c b/drivers/amba/bus.c
index 82b65e1..d15acbb 100644
--- a/drivers/amba/bus.c
+++ b/drivers/amba/bus.c
@@ -564,9 +564,9 @@
 	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;