[Bug Report] nvme-cli commands fails to open head disk node and print error

[Christoph Hellwig]

On Thu, Mar 28, 2024 at 12:00:07PM +0530, Nilay Shroff wrote:
> One of namespaces has zero disk capacity:
> 
> # nvme id-ns /dev/nvme0 -n 0x3
> NVME Identify Namespace 3:
> nsze    : 0
> ncap    : 0
> nuse    : 0
> nsfeat  : 0x14
> nlbaf   : 4
> flbas   : 0
> <snip>

How can you have a namespace with a zero capacity?  NCAP is used
as the check for legacy pre-ns scan controllers to check that
the namespace exists.