arm64/ascend: mm: Fix hugetlb check node error

ascend inclusion
category: bugfix
bugzilla: NA
CVE: NA

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The vm_flags will changed by MAP_CHECKNODE,
so we must use it for output argument.

Fixes: d0a645813b91 ("arm64/ascend: mm: Fix arm32 compile warnings")
Signed-off-by: Fang Lijun <fanglijun3@huawei.com>
Reviewed-by: Ding Tianhong <dingtianhong@huawei.com>
Reviewed-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Signed-off-by: Cheng Jian <cj.chengjian@huawei.com>