io_uring: deduplicate io_get_cqe() calls

Deduplicate calls to io_get_cqe() from __io_fill_cqe_req().

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/4fa077986cc3abab7c59ff4e7c390c783885465f.1655455613.git.asml.silence@gmail.com


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