io_uring: silence false positive warnings

If we kill a ring and then immediately exit the task, we'll get
cancellattion running by the task and a kthread in io_ring_exit_work.
For DEFER_TASKRUN, we do want to limit it to only one entity executing
it, however it's currently not an issue as it's protected by uring_lock.

Silence lockdep assertions for now, we'll return to it later.

Reported-by:  <syzbot+1bcb75613069ad4957fc@syzkaller.appspotmail.com>
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/7e5f68281acb0f081f65fde435833c68a3b7e02f.1736257837.git.asml.silence@gmail.com


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