genirq: cleanup the sparseirq modifications

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
diff --git a/kernel/irq/handle.c b/kernel/irq/handle.c
index 9fe86b3..a69368f 100644
--- a/kernel/irq/handle.c
+++ b/kernel/irq/handle.c
@@ -68,9 +68,8 @@
  */
 static void ack_bad(unsigned int irq)
 {
-	struct irq_desc *desc;
+	struct irq_desc *desc = irq_to_desc(irq);
 
-	desc = irq_to_desc(irq);
 	print_irq_desc(irq, desc);
 	ack_bad_irq(irq);
 }