powerpc/irq: Convert obsolete irq_desc_t to struct irq_desc

Impact: cleanup

Convert the last remaining users.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
CC: Benjamin Herrenschmidt <benh@kernel.crashing.org>
CC: linuxppc-dev@ozlabs.org
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
diff --git a/arch/powerpc/platforms/iseries/irq.c b/arch/powerpc/platforms/iseries/irq.c
index 701d929..94f4447 100644
--- a/arch/powerpc/platforms/iseries/irq.c
+++ b/arch/powerpc/platforms/iseries/irq.c
@@ -214,7 +214,7 @@
 	unsigned long flags;
 
 	for_each_irq (irq) {
-		irq_desc_t *desc = get_irq_desc(irq);
+		struct irq_desc *desc = get_irq_desc(irq);
 
 		if (desc && desc->chip && desc->chip->startup) {
 			spin_lock_irqsave(&desc->lock, flags);