io_uring: set TASK_RUNNING right after schedule

Instead of constantly watching that the state of the task is running
before executing tw or taking locks in io_cqring_wait(), switch it back
to TASK_RUNNING immediately.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/246dddee247d89fd52023f785ed17cc34962a008.1672916894.git.asml.silence@gmail.com


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