Refactor code to use String::new instead of manually creating an emp…

…ty string

src/find/matchers/printf.rs

@@ -467,7 +467,7 @@ fn format_directive<'entry>(
                 .into_iter()
                 .find(|fs| fs.dev_id == dev_id)
                 .map(|fs| fs.fs_type)
-                .unwrap_or_else(|| "".to_owned())
+                .unwrap_or_else(|| String::new())
                 .into()
         }