net/mlx5: DR, Remove useless set memory to zero use memset()

The memory return by kzalloc() has already be set to zero, so
remove useless memset(0).
Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>

drivers/net/ethernet/mellanox/mlx5/core/steering/dr_send.c

@@ -899,7 +899,6 @@ int mlx5dr_send_ring_alloc(struct mlx5dr_domain *dmn)
 		goto clean_qp;
 	}
 
-	memset(dmn->send_ring->buf, 0, size);
 	dmn->send_ring->buf_size = size;
 
 	dmn->send_ring->mr = dr_reg_mr(dmn->mdev,