genirq: Fix affinity notifier fallout

The new code of commit cd7eab44e(genirq: Add IRQ affinity notifiers)
references irq_desc.affinity which fails to compile with
CONFIG_GENERIC_HARDIRQS_NO_DEPRECATED=y.

Use irq_desc.irq_data.affinity instead.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Ben Hutchings <bhutchings@solarflare.com>
diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
index 0587c5c..538fce2 100644
--- a/kernel/irq/manage.c
+++ b/kernel/irq/manage.c
@@ -179,7 +179,7 @@
 		cpumask_copy(cpumask, desc->pending_mask);
 	else
 #endif
-		cpumask_copy(cpumask, desc->affinity);
+		cpumask_copy(cpumask, desc->irq_data.affinity);
 	raw_spin_unlock_irqrestore(&desc->lock, flags);
 
 	notify->notify(notify, cpumask);