mm/memory-failure.c: minor cleanup for HWPoisonHandlable

mm/memory-failure.c: minor cleanup for HWPoisonHandlable

Patch series "A few fixup and cleanup patches for memory failure", v2.

This series contains a patch to clean up the HWPoisonHandlable and another
one to dissolve truncated hugetlb page.  More details can be found in the
respective changelogs.

This patch (of 2):

The local variable movable can be removed by returning true directly. Also
fix typo 'mirgate'. No functional change intended.

Link: https://lkml.kernel.org/r/20220414114941.11223-1-linmiaohe@huawei.com
Link: https://lkml.kernel.org/r/20220414114941.11223-2-linmiaohe@huawei.com
Signed-off-by: Miaohe Lin <linmiaohe@huawei.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Yang Shi <shy828301@gmail.com>
Acked-by: Naoya Horiguchi <naoya.horiguchi@nec.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>