RDMA/mlx5: Fix -Wformat warning in check_ucmd_data()

Variables of type size_t should use %zu rather than %lu [1]. The variables
"inlen", "ucmd", "last", and "size" are all size_t, so use the correct
format specifiers.

[1] https://www.kernel.org/doc/html/latest/core-api/printk-formats.html

Fixes: e383085c24 ("RDMA/mlx5: Set ECE options during QP create")
Link: https://lore.kernel.org/r/20200605023012.9527-1-tseewald@gmail.com
Signed-off-by: Tom Seewald <tseewald@gmail.com>
Acked-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>

drivers/infiniband/hw/mlx5/qp.c

@@ -2907,7 +2907,7 @@ static int check_ucmd_data(struct mlx5_ib_dev *dev,
 	if (!ret)
 		mlx5_ib_dbg(
 			dev,
-			"udata is not cleared, inlen = %lu, ucmd = %lu, last = %lu, size = %lu\n",
+			"udata is not cleared, inlen = %zu, ucmd = %zu, last = %zu, size = %zu\n",
 			udata->inlen, params->ucmd_size, last, size);
 	return ret ? 0 : -EINVAL;
 }