mm/memory-failure: use helper llist_for_each_entry()

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.com
Signed-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>