[PATCH] nvme: remove ns->disk checks

[Keith Busch]

On Wed, Jul 08, 2020 at 04:40:15PM +0200, Christoph Hellwig wrote:
> By the time a namespace is added to ctrl->namespaces list and thus
> can be looked up ns->disk has been assigned, and it it never cleared.
> 
> Remove all the checks for ns->disk being NULL.

Looks like all these pointless checks were from an older interaction
with lightnvm that is no longer applicable, so looks good.

Reviewed-by: Keith Busch <kbusch at kernel.org>