io-wq: Drop intermediate step between pending list and active work

next_work is only used to make the work visible for
cancellation. Instead, we can just directly write to cur_work before
dropping the acct_lock and avoid the extra hop.

Signed-off-by: Gabriel Krisman Bertazi <krisman@suse.de>
Link: https://lore.kernel.org/r/20240416021054.3940-3-krisman@suse.de


Signed-off-by: Jens Axboe <axboe@kernel.dk>