IB/ehca: Fix memleak on module unloading

Percpu data is not freed on module unloading.

Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Christoph Raisch <raisch@de.ibm.com>
Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Acked-by: Hoang-Nam Nguyen <hnguyen@de.ibm.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>

drivers/infiniband/hw/ehca/ehca_irq.c

@@ -756,6 +756,8 @@ void ehca_destroy_comp_pool(void)
 		if (cpu_online(i))
 			destroy_comp_task(pool, i);
 	}
+	free_percpu(pool->cpu_comp_tasks);
+	kfree(pool);
 #endif
 
 	return;