nvdimm: Remove dead code for ENODEV checking in scan_labels()

The only way create_namespace_pmem() returns an ENODEV code is if
select_pmem_id(nd_region, &uuid) returns ENODEV when its 2nd parameter
is a null pointer. However, this is impossible because &uuid is always
valid.

Furthermore, create_namespace_pmem() is the only user of
select_pmem_id(), it's safe to remove the 'return -ENODEV' branch.
Signed-off-by: Li Zhijian <lizhijian@fujitsu.com>
Reviewed-by: Ira Weiny <ira.weiny@intel.com>
Link: https://patch.msgid.link/20240819062045.1481298-2-lizhijian@fujitsu.comSigned-off-by: Ira Weiny <ira.weiny@intel.com>

drivers/nvdimm/namespace_devs.c

@@ -1612,9 +1612,6 @@ static int select_pmem_id(struct nd_region *nd_region, const uuid_t *pmem_id)
 {
 	int i;
 
-	if (!pmem_id)
-		return -ENODEV;
-
 	for (i = 0; i < nd_region->ndr_mappings; i++) {
 		struct nd_mapping *nd_mapping = &nd_region->mapping[i];
 		struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
@@ -1790,9 +1787,6 @@ static struct device *create_namespace_pmem(struct nd_region *nd_region,
 	case -EINVAL:
 		dev_dbg(&nd_region->dev, "invalid label(s)\n");
 		break;
-	case -ENODEV:
-		dev_dbg(&nd_region->dev, "label not found\n");
-		break;
 	default:
 		dev_dbg(&nd_region->dev, "unexpected err: %d\n", rc);
 		break;
@@ -1980,9 +1974,6 @@ static struct device **scan_labels(struct nd_region *nd_region)
 			case -EAGAIN:
 				/* skip invalid labels */
 				continue;
-			case -ENODEV:
-				/* fallthrough to seed creation */
-				break;
 			default:
 				goto err;
 			}