mm: swap_state: use folio_alloc_mpol() in __read_swap_cache_async()

Convert to use folio_alloc_mpol() helper() in __read_swap_cache_async().

Link: https://lkml.kernel.org/r/20240709105508.3933823-1-wangkefeng.wang@huawei.com


Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Cc: Hugh Dickins <hughd@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>