hugetlbfs: use helper macro SZ_1{K,M}

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

This series contains a few cleaup patches to remove unneeded forward
declaration, use helper macro and so on.  More details can be found in the
respective changelogs.


This patch (of 5):

Use helper macro SZ_1K and SZ_1M to do the size conversion.  Minor
readability improvement.

Link: https://lkml.kernel.org/r/20220726142918.51693-1-linmiaohe@huawei.com
Link: https://lkml.kernel.org/r/20220726142918.51693-2-linmiaohe@huawei.com


Signed-off-by: Miaohe Lin <linmiaohe@huawei.com>
Reviewed-by: Mike Kravetz <mike.kravetz@oracle.com>
Reviewed-by: Muchun Song <songmuchun@bytedance.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>