btrfs-progs: tree-checker: handle owner ref items

Add the new OWNER_REF inline items to the tree-checker extent item
checking code. We could somehow validate the root id for being a valid
fstree id, but just skipping it seems fine as well.

Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Boris Burkov <boris@bur.io>
Signed-off-by: David Sterba <dsterba@suse.com>

kernel-shared/tree-checker.c

@@ -1477,6 +1477,9 @@ static int check_extent_item(struct extent_buffer *leaf,
 			}
 			inline_refs += btrfs_shared_data_ref_count(leaf, sref);
 			break;
+		case BTRFS_EXTENT_OWNER_REF_KEY:
+			/* Root id could be verified as well. */
+			break;
 		default:
 			extent_err(leaf, slot, "unknown inline ref type: %u",
 				   inline_type);