general: clippy lint fixes

src/application.rs

@@ -106,6 +106,7 @@ glib::wrapper! {
 }
 
 // This is where the member functions of IvApplication go.
+#[allow(clippy::new_without_default)]
 impl IvApplication {
     pub fn new() -> Self {
         glib::Object::new(&[

src/util.rs

@@ -1,7 +1,7 @@
 use gio::prelude::*;
 use glib::translate::*;
 
-pub fn utf8_collate_key_for_filename(filename: &String) -> String {
+pub fn utf8_collate_key_for_filename(filename: &str) -> String {
     unsafe {
         from_glib_full(glib::ffi::g_utf8_collate_key_for_filename(
             filename.to_glib_none().0,

src/widgets/image_view.rs

@@ -431,7 +431,7 @@ impl IvImageView {
 }
 
 async fn set_wallpaper(uri: String) {
-    match wallpaper::set_from_uri(
+    if let Err(e) = wallpaper::set_from_uri(
         &WindowIdentifier::default(),
         &uri,
         false,
@@ -439,10 +439,9 @@ async fn set_wallpaper(uri: String) {
     )
     .await
     {
-        Err(e) => log::error!(
+        log::error!(
             "Failed to set the wallpaper using the freedesktop portal: {}",
             e
-        ),
-        Ok(_) => (),
+        );
     }
 }