ext4: remove page offset calculation in ext4_block_truncate_page()

ext4: remove page offset calculation in ext4_block_truncate_page()

For bs <= ps scenarios, calculating the offset within the block is
sufficient. For bs > ps, an initial page offset calculation can lead to
incorrect behavior. Thus this redundant calculation has been removed.

Signed-off-by: Baokun Li <libaokun1@huawei.com>
Reviewed-by: Zhang Yi <yi.zhang@huawei.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Reviewed-by: Ojaswin Mujoo <ojaswin@linux.ibm.com>
Message-ID: <20251121090654.631996-3-libaokun@huaweicloud.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>