Fix lint issues from rustc.

Signed-off-by: Wren Turkal <wt@penguintechs.org>

ahcid/src/scheme.rs

@@ -1,6 +1,6 @@
 use std::collections::BTreeMap;
 use std::{cmp, str};
-use std::convert::{TryFrom, TryInto};
+use std::convert::{TryFrom};
 use std::fmt::Write;
 use std::io::prelude::*;
 use std::io::SeekFrom;

e1000d/src/device.rs

@@ -1,5 +1,5 @@
 use std::collections::BTreeMap;
-use std::{cmp, mem, ptr, slice, thread};
+use std::{cmp, mem, ptr, slice};
 
 use netutils::setcfg;
 use syscall::error::{Error, Result, EACCES, EBADF, EINVAL, EWOULDBLOCK};

pcid/src/pci/msi.rs

@@ -105,7 +105,7 @@ impl MsiCapability {
     }
     pub fn set_multi_message_enable(&mut self, log_mme: u8) {
         let mut new_message_control = self.message_control() & (!Self::MC_MULTI_MESSAGE_ENABLE_MASK);
-        new_message_control |= (u16::from(log_mme) << Self::MC_MULTI_MESSAGE_ENABLE_SHIFT);
+        new_message_control |= u16::from(log_mme) << Self::MC_MULTI_MESSAGE_ENABLE_SHIFT;
         self.set_message_control(new_message_control);
     }