io_uring: don't delay io_init_req() error check

Don't postpone io_init_req() error checks and do that right after
calling it. There is no control-flow statements or dependencies with
sqe/submitted accounting, so do those earlier, that makes the code flow
a bit more natural.
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

fs/io_uring.c

@@ -6466,12 +6466,11 @@ static int io_submit_sqes(struct io_ring_ctx *ctx, unsigned int nr)
 				submitted = -EAGAIN;
 			break;
 		}
-
-		err = io_init_req(ctx, req, sqe, &state);
 		io_consume_sqe(ctx);
 		/* will complete beyond this point, count as submitted */
 		submitted++;
 
+		err = io_init_req(ctx, req, sqe, &state);
 		if (unlikely(err)) {
 fail_req:
 			io_put_req(req);