quota: Add more checking after reading from quota file

hulk inclusion
category: bugfix
bugzilla: 187046, https://gitee.com/openeuler/kernel/issues/I5QH0X


CVE: NA

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It would be better to do more sanity checking (eg. dqdh_entries,
block no.) for the content read from quota file, which can prevent
corrupting the quota file.

Signed-off-by: Zhihao Cheng <chengzhihao1@huawei.com>
Signed-off-by: Li Lingfeng <lilingfeng3@huawei.com>
Reviewed-by: Zhihao Cheng <chengzhihao1@huawei.com>
Reviewed-by: Zhang Yi <yi.zhang@huawei.com>
Signed-off-by: Yongqiang Liu <liuyongqiang13@huawei.com>