Revert "loop: Check for overflow while configuring loop"

hulk inclusion
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I7JHOA


CVE: NA

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This reverts commit ba3f75d0.

The location of the code merge is wrong, roll back and start again.

Signed-off-by: Zhong Jinghua <zhongjinghua@huawei.com>
Reviewed-by: Yu Kuai <yukuai3@huawei.com>
Signed-off-by: Yongqiang Liu <liuyongqiang13@huawei.com>