fix: clippy errors

Signed-off-by: WoodenMaiden <yann.pomie@laposte.net>

initramfs/src/image.rs

@@ -202,7 +202,6 @@ mod test {
     use super::{FileHandler, Image};
     use anyhow::Ok;
     use std::env;
-    use std::fs::OpenOptions;
     use std::io::{Read, Write};
 
     const VALID_IMAGE_NAME: &str = "my_awesome_img:14md35";
@@ -238,19 +237,19 @@ mod test {
         where
             Self: std::marker::Sized,
         {
-            Ok(Self::new(&path.to_string()))
+            Ok(Self::new(path))
         }
 
         fn open(path: &str) -> anyhow::Result<Self>
         where
             Self: std::marker::Sized,
         {
-            Ok(Self::new(&path.to_string()))
+            Ok(Self::new(path))
         }
     }
 
     impl MockFileHandler {
-        fn new(_path: &String) -> Self {
+        fn new(_path: &str) -> Self {
             Self { vec: Vec::new() }
         }
     }