mm: sharepool: fix hugepage_rsvd count increase error

hulk inclusion
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I5RO2H


CVE: NA

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When nr_hugepages is configured, sharepool allocates hugepages first
from hugetlb pool, then from buddy system if the pool had been used up.
Current page release function treat the buddy system hugepages as
hugetlb pages, which caused HugePages_Rsvd to increase improperly.

Add a check in page release function:
    if the page is temporary, do not call hugetlb_unreserve_pages.

Signed-off-by: Guo Mengqi <guomengqi3@huawei.com>
Reviewed-by: Weilong Chen <chenweilong@huawei.com>
Signed-off-by: Yongqiang Liu <liuyongqiang13@huawei.com>