[PATCH] net/mlx5/hws: fix memory leak on general pool db init

[Matan Azrad]

From: Alex Vesker <valex at nvidia.com>
> On elemend db init we allocated the element_manager which was unused
> and not freed.
> 
> Fixes: b4dd7bcb0dcbe ("net/mlx5/hws: add pool and buddy")
> Signed-off-by: Alex Vesker <valex at nvidia.com>
> Reviewed-by: Erez Shitrit <erezsh at nvidia.com>

Acked-by: Matan Azrad <matan at nvidia.com>