ext4: replace opencoded ext4_end_io_end() in ext4_put_io_end()

This reduces duplicate code and ensures that a “potential data loss”
warning is available if the unwritten conversion fails.

Signed-off-by: Baokun Li <libaokun1@huawei.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Reviewed-by: Zhang Yi <yi.zhang@huawei.com>
Link: https://patch.msgid.link/20250122110533.4116662-2-libaokun@huaweicloud.com


Signed-off-by: Theodore Ts'o <tytso@mit.edu>