ubifs: Remove the redundant return in dbg_check_nondata_nodes_order

mainline inclusion
from mainline-v5.11-rc1
commit 32f6ccc7
category: bugfix
bugzilla: 182885 https://gitee.com/openeuler/kernel/issues/I4DDEL

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=32f6ccc743b89bb4c51d4a868ffdb6ebda2909cf



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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>
Signed-off-by: Zhihao Cheng <chengzhihao1@huawei.com>
Reviewed-by: Zhang Xiaoxu <zhangxiaoxu5@huawei.com>

Signed-off-by: Chen Jun <chenjun102@huawei.com>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>