mm/z3fold: declare z3fold_mount with __init

mm/z3fold: declare z3fold_mount with __init

Patch series "A few cleanup patches for z3fold", v2.

This series contains a few patches to simplify the code, remove unneeded
code, fix obsolete comment and so on.  More details can be found in the
respective changelogs.

This patch (of 8):

z3fold_mount is only called during init.  So we should declare it with
__init.

Link: https://lkml.kernel.org/r/20220308134311.59086-1-linmiaohe@huawei.com
Link: https://lkml.kernel.org/r/20220308134311.59086-2-linmiaohe@huawei.com
Signed-off-by: Miaohe Lin <linmiaohe@huawei.com>
Reviewed-by: Vitaly Wool <vitaly.wool@konsulko.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>