io_uring: use io_cq_lock consistently

There is one place when we forgot to change hand coded spin locking with
io_cq_lock(), change it to be more consistent. Note, the unlock part is
already __io_cq_unlock_post().

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/91699b9a00a07128f7ca66136bdbbfc67a64659e.1662639236.git.asml.silence@gmail.com


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