IB/core: constify mmu_notifier_ops structures

This mmu_notifier_ops structure is never modified, so declare it as
const, like the other mmu_notifier_ops structures.

Done with the help of Coccinelle.
Signed-off-by: NJulia Lawall <Julia.Lawall@lip6.fr>
Reviewed-by: NHaggai Eran <haggaie@mellanox.com>
Signed-off-by: NDoug Ledford <dledford@redhat.com>

drivers/infiniband/core/umem_odp.c

@@ -232,7 +232,7 @@ static void ib_umem_notifier_invalidate_range_end(struct mmu_notifier *mn,
 	ib_ucontext_notifier_end_account(context);
 }
 
-static struct mmu_notifier_ops ib_umem_notifiers = {
+static const struct mmu_notifier_ops ib_umem_notifiers = {
 	.release                    = ib_umem_notifier_release,
 	.invalidate_page            = ib_umem_notifier_invalidate_page,
 	.invalidate_range_start     = ib_umem_notifier_invalidate_range_start,