ext4: factor out ext4_journal_data_mode_check()

Factor out ext4_journal_data_mode_check(). No functional change.

Signed-off-by: Jason Yan <yanaijie@huawei.com>
Reviewed-by: Jan <Kara&lt;jack@suse.cz>
Reviewed-by: Ritesh Harjani (IBM) <ritesh.list@gmail.com>
Link: https://lore.kernel.org/r/20220916141527.1012715-14-yanaijie@huawei.com


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