mm: memory-failure: kill soft_offline_free_page()

[ Upstream commit 7adb4588 ]

Open-code the page_handle_poison() into soft_offline_page() and kill
unneeded soft_offline_free_page().

Link: https://lkml.kernel.org/r/20220819033402.156519-1-wangkefeng.wang@huawei.com


Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Reviewed-by: Miaohe Lin <linmiaohe@huawei.com>
Acked-by: Naoya Horiguchi <naoya.horiguchi@nec.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Stable-dep-of: e2c1ab07 ("mm: memory-failure: fix unexpected return value in soft_offline_page()")
Signed-off-by: Sasha Levin <sashal@kernel.org>