Fix missing use statement

parent beef1609
use std::mem::size_of; use std::mem::size_of;
use std::ops::DerefMut; use std::ops::DerefMut;
use std::{ptr, u32}; use std::{ptr, u32};
use std::thread;
use syscall::io::{Dma, Io, Mmio}; use syscall::io::{Dma, Io, Mmio};
use syscall::error::{Error, Result, EIO}; use syscall::error::{Error, Result, EIO};
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