fix clippy (#112)

* Fix clippy double use error

* Macos also

Author: andrewdavidmackenzie

src/libproc/sys/linux.rs

@@ -96,9 +96,6 @@ mod test {
     use std::collections::{HashMap, HashSet};
     use std::io::{Error, Write};
 
-    use procfs;
-    use tempfile;
-
     use super::*;
 
     #[test]

src/libproc/sys/macos.rs

@@ -131,7 +131,6 @@ pub(crate) fn listpidspath(
 #[cfg(test)]
 mod test {
     use std::collections::{HashMap, HashSet};
-    use std::io;
 
     use super::*;