tree-wide: fix needless borrows

found and fixed via clippy

Signed-off-by: Fabian Grünbichler <f.gruenbichler@proxmox.com>

src/tape/changer/mtx/mtx_wrapper.rs

@@ -21,7 +21,7 @@ pub fn mtx_status(config: &ScsiTapeChanger) -> Result<MtxStatus, Error> {
 
     let mut status = parse_mtx_status(&output)?;
 
-    status.mark_import_export_slots(&config)?;
+    status.mark_import_export_slots(config)?;
 
     Ok(status)
 }

src/tape/changer/mtx/parse_mtx_status.rs

@@ -203,7 +203,7 @@ Data Transfer Element 1:Empty
       Storage Element 24 IMPORT/EXPORT:Empty
 "###;
 
-    let _ = parse_mtx_status(&output)?;
+    let _ = parse_mtx_status(output)?;
 
     Ok(())
 }