mm/hugetlb: fix nid mismatch in alloc_surplus_hugetlb_folio()

mm/hugetlb: fix nid mismatch in alloc_surplus_hugetlb_folio()

It's wrong to use nid directly since the nid may be changed in allocation.
Use folio_nid() to obtain the nid of folio instead.

Fix: 2273dea6b1e1 ("mm/hugetlb: update nr_huge_pages and surplus_huge_pages together")
Link: https://lkml.kernel.org/r/20250403064138.2867929-1-liushixin2@huawei.com
Signed-off-by: Liu Shixin <liushixin2@huawei.com>
Acked-by: Oscar Salvador <osalvador@suse.de>
Cc: David Hildenbrand <david@redhat.com>
Cc: Kefeng Wang <wangkefeng.wang@huawei.com>
Cc: Muchun Song <muchun.song@linux.dev>
Cc: Nanyong Sun <sunnanyong@huawei.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>