clippy: Fix several clippy issues

In order to enable several clippy lint groups fix several findings.

src/sysv/list.rs

@@ -10,10 +10,11 @@ use std::{
 pub struct List {}
 
 impl List {
+    #[allow(clippy::unused_self)]
     pub fn run(&self) -> Result<()> {
         for line in BufReader::new(File::open("/proc/sysvipc/msg")?).lines() {
-            for field in line?.split_whitespace().collect::<Vec<&str>>() {
-                print!("{0: <10}", field);
+            for field in line?.split_whitespace() {
+                print!("{field: <10}");
             }
 
             println!();