ia64: Use irqd_irq_disabled() instead of desc->status access

Remove the last open coded access to irq_desc.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
diff --git a/arch/ia64/kernel/irq.c b/arch/ia64/kernel/irq.c
index 3fbf4bf..ba2760d 100644
--- a/arch/ia64/kernel/irq.c
+++ b/arch/ia64/kernel/irq.c
@@ -137,7 +137,7 @@
 		struct irq_data *data = irq_desc_get_irq_data(desc);
 		struct irq_chip *chip = irq_data_get_irq_chip(data);
 
-		if (desc->status == IRQ_DISABLED)
+		if (irqd_irq_disabled(data))
 			continue;
 
 		/*