When Direct Rules API is not supported we don't set the errno.
This results in failing the function but with errno equals to zero.
The result of this is that a function that failed, is considered as
a function that worked correctly.
This commit fixes this issue by setting the errno to ENOTSUP and
returning this error when error value should be returned.
Since RDMA-CORE are returning positive errno we are also returning
positive error values.
Fixes: 4f84a19779ca ("net/mlx5: add Direct Rules API")
Signed-off-by: Ori Kam <orika@mellanox.com>
Acked-by: Shahaf Shuler <shahafs@mellanox.com>
617ecc9000