qib_keys: Replace rcu_assign_pointer() with RCU_INIT_POINTER()

The uses of "rcu_assign_pointer()" are NULLing out the pointers. According to RCU_INIT_POINTER()'s block comment:
"1. This use of RCU_INIT_POINTER() is NULLing out the pointer"
it is better to use it instead of rcu_assign_pointer() because it has a smaller overhead.

The following Coccinelle semantic patch was used:
@@
@@

- rcu_assign_pointer
+ RCU_INIT_POINTER
(..., NULL)

---
 drivers/infiniband/hw/qib/qib_keys.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

index 3b9afcc..ad843c7 100644
@@ -122,10 +122,10 @@ void qib_free_lkey(struct qib_mregion *mr)
 	if (!mr->lkey_published)
 		goto out;
 	if (lkey == 0)
-		rcu_assign_pointer(dev->dma_mr, NULL);
+		RCU_INIT_POINTER(dev->dma_mr, NULL);
 	else {
 		r = lkey >> (32 - ib_qib_lkey_table_size);
-		rcu_assign_pointer(rkt->table[r], NULL);
+		RCU_INIT_POINTER(rkt->table[r], NULL);
 	}
 	qib_put_mr(mr);
 	mr->lkey_published = 0;

1.9.1

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I would prefer the summary be:
IB/qib: qib_remove_lkey() Replace rcu_assign_pointer() with

Otherwise the patch looks ok and has been tested.
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