clippy fixups for Default impls

Signed-off-by: Wolfgang Bumiller <w.bumiller@proxmox.com>

src/tape/media_catalog.rs

@@ -928,6 +928,7 @@ impl MediaCatalog {
 /// Media set catalog
 ///
 /// Catalog for multiple media.
+#[derive(Default)]
 pub struct MediaSetCatalog {
     catalog_list: HashMap<Uuid, MediaCatalog>,
 }
@@ -935,9 +936,7 @@ pub struct MediaSetCatalog {
 impl MediaSetCatalog {
     /// Creates a new instance
     pub fn new() -> Self {
-        Self {
-            catalog_list: HashMap::new(),
-        }
+        Self::default()
     }
 
     /// Add a catalog

src/tape/media_set.rs

@@ -15,6 +15,7 @@ pub struct MediaSet {
 impl MediaSet {
     pub const MEDIA_SET_MAX_SEQ_NR: u64 = 100;
 
+    #[allow(clippy::new_without_default)]
     pub fn new() -> Self {
         let uuid = Uuid::generate();
         Self {

src/tape/pool_writer/catalog_set.rs

@@ -7,6 +7,7 @@ use crate::tape::{MediaCatalog, MediaSetCatalog};
 /// Helper to build and query sets of catalogs
 ///
 /// Similar to MediaSetCatalog, but allows to modify the last catalog.
+#[derive(Default)]
 pub struct CatalogSet {
     // read only part
     pub media_set_catalog: MediaSetCatalog,
@@ -17,10 +18,7 @@ pub struct CatalogSet {
 impl CatalogSet {
     /// Create empty instance
     pub fn new() -> Self {
-        Self {
-            media_set_catalog: MediaSetCatalog::new(),
-            catalog: None,
-        }
+        Self::default()
     }
 
     /// Add catalog to the read-only set

src/tools/disks/mod.rs

@@ -769,7 +769,7 @@ pub struct DiskUsageQuery {
 }
 
 impl DiskUsageQuery {
-    pub fn new() -> Self {
+    pub const fn new() -> Self {
         Self {
             smart: true,
             partitions: false,