IB/mlx4_ib: Remove local invalidate segment unused fields

Remove unused fields from the local invalidate WQE segment structure.

Signed-off-by: Haggai Eran <haggaie@mellanox.com>
Signed-off-by: Shani Michaeli <shanim@mellanox.com>
Signed-off-by: Or Gerlitz <ogerlitz@mellanox.com>
Signed-off-by: Roland Dreier <roland@purestorage.com>
diff --git a/drivers/infiniband/hw/mlx4/qp.c b/drivers/infiniband/hw/mlx4/qp.c
index 19e0637..c6dde71 100644
--- a/drivers/infiniband/hw/mlx4/qp.c
+++ b/drivers/infiniband/hw/mlx4/qp.c
@@ -1983,10 +1983,8 @@
 
 static void set_local_inv_seg(struct mlx4_wqe_local_inval_seg *iseg, u32 rkey)
 {
-	iseg->flags	= 0;
-	iseg->mem_key	= cpu_to_be32(rkey);
-	iseg->guest_id	= 0;
-	iseg->pa	= 0;
+	memset(iseg, 0, sizeof(*iseg));
+	iseg->mem_key = cpu_to_be32(rkey);
 }
 
 static __always_inline void set_raddr_seg(struct mlx4_wqe_raddr_seg *rseg,