hugetlbfs: inode: remove unnecessary (void*) conversions

The ei pointer does not need to cast the type.

Link: https://lkml.kernel.org/r/20221107015659.3221-1-zeming@nfschina.com


Signed-off-by: Li zeming <zeming@nfschina.com>
Reviewed-by: Muchun Song <songmuchun@bytedance.com>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>