net/mlx5: Lag, Remove redundant bool allocation on the stack

There is no need to allocate the bool variable and can just return the value.

Signed-off-by: Roi Dayan <roid@nvidia.com>
Reviewed-by: Maor Dickman <maord@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>