IB/core: Use rdma_ah_attr accessor functions

Modify core and driver components to use accessor functions
introduced to access individual fields of rdma_ah_attr

Reviewed-by: Ira Weiny <ira.weiny@intel.com>
Reviewed-by: Don Hiatt <don.hiatt@intel.com>
Reviewed-by: Sean Hefty <sean.hefty@intel.com>
Reviewed-by: Niranjana Vishwanathapura <niranjana.vishwanathapura@intel.com>
Signed-off-by: Dasaratharaman Chandramouli <dasaratharaman.chandramouli@intel.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>

drivers/infiniband/hw/mthca/mthca_mad.c

@@ -82,9 +82,9 @@ static void update_sm_ah(struct mthca_dev *dev,
 		return;
 
 	memset(&ah_attr, 0, sizeof ah_attr);
-	ah_attr.dlid     = lid;
-	ah_attr.sl       = sl;
-	ah_attr.port_num = port_num;
+	rdma_ah_set_dlid(&ah_attr, lid);
+	rdma_ah_set_sl(&ah_attr, sl);
+	rdma_ah_set_port_num(&ah_attr, port_num);
 
 	new_ah = rdma_create_ah(dev->send_agent[port_num - 1][0]->qp->pd,
 				&ah_attr);