[PATCH] vdpa/mlx5: fix leak on event thread creation

[Matan Azrad]

From: David Marchand
> As stated in the manual, pthread_attr_init return value should be checked.
> Besides, a pthread_attr_t should be destroyed once unused.
> 
> In practice, we may have no leak (from what I read in glibc current code), but
> this may change in the future.
> Stick to a correct use of the API.
> 
> Fixes: 5cf3fd3af4df ("vdpa/mlx5: add CPU core parameter to bind polling
> thread")
> Cc: stable at dpdk.org
> 
> Signed-off-by: David Marchand <david.marchand at redhat.com>
Acked-by: Matan Azrad <matan at nvidia.com>

Thanks David!