fixed a few clippy warnings

src/features.rs

@@ -15,15 +15,15 @@ mod os {
     static VERS_2_6_28:  usize = 4;
     static VERS_3:       usize = 5;
 
+    #[inline]
+    fn digit(dst: &mut usize, b: u8) {
+        *dst *= 10;
+        *dst += (b - b'0') as usize;
+    }
+
     fn parse_kernel_version() -> usize {
         let u = uname();
 
-        #[inline]
-        fn digit(dst: &mut usize, b: u8) {
-            *dst *= 10;
-            *dst += (b - b'0') as usize;
-        }
-
         let mut curr:  usize = 0;
         let mut major: usize = 0;
         let mut minor: usize = 0;

src/mqueue.rs

@@ -114,9 +114,9 @@ pub fn mq_getattr(mqd: MQd) -> Result<MqAttr> {
     Ok(attr)
 }
 
-/// Set the attributes of the message queue. Only O_NONBLOCK can be set, everything else will be ignored
+/// Set the attributes of the message queue. Only `O_NONBLOCK` can be set, everything else will be ignored
 /// Returns the old attributes
-/// It is recommend to use the mq_set_nonblock() and mq_remove_nonblock() convenience functions as they are easier to use
+/// It is recommend to use the `mq_set_nonblock()` and `mq_remove_nonblock()` convenience functions as they are easier to use
 ///
 /// [Further reading](http://man7.org/linux/man-pages/man3/mq_setattr.3.html)
 pub fn mq_setattr(mqd: MQd, newattr: &MqAttr) -> Result<MqAttr> {
@@ -127,7 +127,7 @@ pub fn mq_setattr(mqd: MQd, newattr: &MqAttr) -> Result<MqAttr> {
 }
 
 /// Convenience function.
-/// Sets the O_NONBLOCK attribute for a given message queue descriptor
+/// Sets the `O_NONBLOCK` attribute for a given message queue descriptor
 /// Returns the old attributes
 pub fn mq_set_nonblock(mqd: MQd) -> Result<(MqAttr)> {
     let oldattr = try!(mq_getattr(mqd));
@@ -136,7 +136,7 @@ pub fn mq_set_nonblock(mqd: MQd) -> Result<(MqAttr)> {
 }
 
 /// Convenience function.
-/// Removes O_NONBLOCK attribute for a given message queue descriptor
+/// Removes `O_NONBLOCK` attribute for a given message queue descriptor
 /// Returns the old attributes
 pub fn mq_remove_nonblock(mqd: MQd) -> Result<(MqAttr)> {
     let oldattr = try!(mq_getattr(mqd));

src/sys/ptrace.rs

@@ -95,7 +95,7 @@ fn ptrace_other(request: ptrace::PtraceRequest, pid: pid_t, addr: *mut c_void, d
     Errno::result(unsafe { ffi::ptrace(request, pid, addr, data) }).map(|_| 0)
 }
 
-/// Set options, as with ptrace(PTRACE_SETOPTIONS,...).
+/// Set options, as with `ptrace(PTRACE_SETOPTIONS,...)`.
 pub fn ptrace_setoptions(pid: pid_t, options: ptrace::PtraceOptions) -> Result<()> {
     use self::ptrace::*;
     use std::ptr;

src/sys/socket/addr.rs

@@ -348,10 +348,10 @@ impl fmt::Display for Ipv6Addr {
  *
  */
 
-/// A wrapper around sockaddr_un. We track the length of sun_path,
+/// A wrapper around `sockaddr_un`. We track the length of `sun_path`,
 /// because it may not be null-terminated (unconnected and abstract
 /// sockets). Note that the actual sockaddr length is greater by
-/// size_of::<sa_family_t>().
+/// `size_of::<sa_family_t>()`.
 #[derive(Copy)]
 pub struct UnixAddr(pub libc::sockaddr_un, pub usize);
 

src/unistd.rs

@@ -255,7 +255,7 @@ fn pipe2_setflags(fd1: RawFd, fd2: RawFd, flags: OFlag) -> Result<()> {
         Err(e) => {
             let _ = close(fd1);
             let _ = close(fd2);
-            return Err(e);
+            Err(e)
         }
     }
 }