cpumask: use for_each_online_cpu() in drivers/infiniband/hw/ehca/ehca_irq.c

Impact: cleanup

In future, accessing cpu numbers beyond nr_cpu_ids (the runtime limit)
will be undefined.  We can avoid future problems by using
for_each_online_cpu() here.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Acked-by: Hoang-Nam Nguyen <hnguyen@de.ibm.com>
Tested-by: Hoang-Nam Nguyen <hnguyen@de.ibm.com>
Cc: Christoph Raisch <raisch@de.ibm.com>

drivers/infiniband/hw/ehca/ehca_irq.c

@@ -934,10 +934,9 @@ void ehca_destroy_comp_pool(void)
 
 	unregister_hotcpu_notifier(&comp_pool_callback_nb);
 
-	for (i = 0; i < NR_CPUS; i++) {
-		if (cpu_online(i))
-			destroy_comp_task(pool, i);
-	}
+	for_each_online_cpu(i)
+		destroy_comp_task(pool, i);
+
 	free_percpu(pool->cpu_comp_tasks);
 	kfree(pool);
 }