mm: memory-failure: remove unneeded 'inline' annotation

Remove unneeded 'inline' annotation from num_poisoned_pages_inc() and
num_poisoned_pages_sub().  No functional change intended.

Link: https://lkml.kernel.org/r/20230626114343.1846587-1-linmiaohe@huawei.com


Signed-off-by: Miaohe Lin <linmiaohe@huawei.com>
Acked-by: Naoya Horiguchi <naoya.horiguchi@nec.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>