block: set disk->node_id before it's being used

disk->node_id will be refered in allocating in disk_expand_part_tbl, so we
should set it before disk->node_id is refered.

Signed-off-by: Cheng Renquan <crquan@gmail.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
diff --git a/block/genhd.c b/block/genhd.c
index 27549e4..2f7feda 100644
--- a/block/genhd.c
+++ b/block/genhd.c
@@ -1102,6 +1102,7 @@
 			kfree(disk);
 			return NULL;
 		}
+		disk->node_id = node_id;
 		if (disk_expand_part_tbl(disk, 0)) {
 			free_part_stats(&disk->part0);
 			kfree(disk);
@@ -1116,7 +1117,6 @@
 		device_initialize(disk_to_dev(disk));
 		INIT_WORK(&disk->async_notify,
 			media_change_notify_thread);
-		disk->node_id = node_id;
 	}
 	return disk;
 }