engines/io_uring: don't use abs() on an unsigned value

It doesn't make any sense, for obvious reasons.

Fixes: ebe67b6 ("io_uring: Add IO_U_F_DEVICE_ERROR to identify error types")
Signed-off-by: Jens Axboe <axboe@kernel.dk>

engines/io_uring.c

@@ -589,7 +589,7 @@ static struct io_u *fio_ioring_cmd_event(struct thread_data *td, int event)
 		io_u_set(td, io_u, IO_U_F_DEVICE_ERROR);
 	else
 		io_u_clear(td, io_u, IO_U_F_DEVICE_ERROR);
-	io_u->error = abs(io_u->error);
+	io_u->error = io_u->error;
 	return io_u;
 }