hugetlb: show nr_huge_pages in report_hugepages()

The number of pre-allocated huge pages should be nr_huge_pages, not
free_huge_pages, although they are same during booting stage

Link: https://lkml.kernel.org/r/20250515114231.65824-1-xuwenjie04@baidu.com
Signed-off-by: Wenjie Xu <xuwenjie04@baidu.com>
Signed-off-by: Li RongQing <lirongqing@baidu.com>
Acked-by: Oscar Salvador <osalvador@suse.de>
Cc: Muchun Song <muchun.song@linux.dev>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

Author: Wenjie Xu

mm/hugetlb.c

@@ -3733,7 +3733,7 @@ static void __init report_hugepages(void)
 
 		string_get_size(huge_page_size(h), 1, STRING_UNITS_2, buf, 32);
 		pr_info("HugeTLB: registered %s page size, pre-allocated %ld pages\n",
-			buf, h->free_huge_pages);
+			buf, h->nr_huge_pages);
 		if (nrinvalid)
 			pr_info("HugeTLB: %s page size: %lu invalid page%s discarded\n",
 					buf, nrinvalid, nrinvalid > 1 ? "s" : "");