mm/memory-failure: use helper llist_for_each_entry()

Change the llist_for_each_entry_safe function to the llist_for_each_entry
function and delete the next variable.  Because the linked list is not
modified,the llist_for_each_entry_safe function is not required.  No
functional changes are intended.

Link: https://lkml.kernel.org/r/20240513075830.2611-1-liyifei28@huawei.comSigned-off-by: Yifei Li <liyifei28@huawei.com>
Acked-by: Miaohe Lin <linmiaohe@huawei.com>
Cc: Jiaqi Yan <jiaqiyan@google.com>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Naoya Horiguchi <nao.horiguchi@gmail.com>
Cc: Ryan Roberts <ryan.roberts@arm.com>
Cc: Shiyang Ruan <ruansy.fnst@fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

mm/memory-failure.c

@@ -1935,7 +1935,7 @@ static int folio_set_hugetlb_hwpoison(struct folio *folio, struct page *page)
 {
 	struct llist_head *head;
 	struct raw_hwp_page *raw_hwp;
-	struct raw_hwp_page *p, *next;
+	struct raw_hwp_page *p;
 	int ret = folio_test_set_hwpoison(folio) ? -EHWPOISON : 0;
 
 	/*
@@ -1946,7 +1946,7 @@ static int folio_set_hugetlb_hwpoison(struct folio *folio, struct page *page)
 	if (folio_test_hugetlb_raw_hwp_unreliable(folio))
 		return -EHWPOISON;
 	head = raw_hwp_list_head(folio);
-	llist_for_each_entry_safe(p, next, head->first, node) {
+	llist_for_each_entry(p, head->first, node) {
 		if (p->page == page)
 			return -EHWPOISON;
 	}