io_uring: ensure local task_work is run on wait timeout

A previous commit added an earlier break condition here, which is fine if
we're using non-local task_work as it'll be run on return to userspace.
However, if DEFER_TASKRUN is used, then we could be leaving local
task_work that is ready to process in the ctx list until next time that
we enter the kernel to wait for events.

Move the break condition to _after_ we have run task_work.

Cc: stable@vger.kernel.org
Fixes: 846072f1 ("io_uring: mimimise io_cqring_wait_schedule")
Signed-off-by: Jens Axboe <axboe@kernel.dk>