ubifs: Remove the redundant return in dbg_check_nondata_nodes_order

There is a redundant return in dbg_check_nondata_nodes_order,
which will be never reached. In addition, error code should be
returned instead of zero in this branch.
Signed-off-by: Chengsong Ke <kechengsong@huawei.com>
Signed-off-by: Richard Weinberger <richard@nod.at>

fs/ubifs/debug.c

@@ -2442,7 +2442,6 @@ int dbg_check_nondata_nodes_order(struct ubifs_info *c, struct list_head *head)
 	ubifs_msg(c, "dumping second node");
 	ubifs_dump_node(c, sb->node);
 	return -EINVAL;
-	return 0;
 }
 
 static inline int chance(unsigned int n, unsigned int out_of)