ubifs: Drop unnecessary setting of zbr->znode

in dbg_walk_index ubifs_load_znode is used to load the znode behind
a zbranch. ubifs_load_znode links the new child znode to the zbranch,
so doing it again is unnecessary.
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Richard Weinberger <richard@nod.at>

fs/ubifs/debug.c

@@ -1603,7 +1603,6 @@ int dbg_walk_index(struct ubifs_info *c, dbg_leaf_callback leaf_cb,
 				err = PTR_ERR(child);
 				goto out_unlock;
 			}
-			zbr->znode = child;
 		}
 
 		znode = child;