ext4: make ext4_es_insert_delayed_block() return void

Now it never fails when inserting a delay extent, so the return value in
ext4_es_insert_delayed_block is no longer necessary, let it return void.

[ Fixed bug which caused system hangs during bigalloc test runs.  See
 https://lore.kernel.org/r/20230612030405.GH1436857@mit.edu

 for more
 details.  -- TYT ]

Signed-off-by: Baokun Li <libaokun1@huawei.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Link: https://lore.kernel.org/r/20230424033846.4732-11-libaokun1@huawei.com


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