nvme: don't create a multipath node for zero capacity devices

Apparently there are nvme controllers around that report namespaces
in the namespace list which have zero capacity.  Return -ENXIO instead
of -ENODEV from nvme_update_ns_info_block so we don't create a hidden
multipath node for these namespaces but entirely ignore them.

Fixes: 46e7422 ("nvme: move common logic into nvme_update_ns_info")
Reported-by: Nilay Shroff <[email protected]>
Signed-off-by: Christoph Hellwig <[email protected]>
Tested-by: Nilay Shroff <[email protected]>
Reviewed-by: Chaitanya Kulkarni <[email protected]>
Signed-off-by: Keith Busch <[email protected]>

drivers/nvme/host/core.c

@@ -2089,7 +2089,7 @@ static int nvme_update_ns_info_block(struct nvme_ns *ns,
 	if (id->ncap == 0) {
 		/* namespace not allocated or attached */
 		info->is_removed = true;
-		ret = -ENODEV;
+		ret = -ENXIO;
 		goto out;
 	}
 	lbaf = nvme_lbaf_index(id->flbas);