crypto: Fix some clippy warnings

matrix_sdk_crypto/src/key_request.rs

@@ -1012,7 +1012,7 @@ impl KeyRequestMachine {
                             match self
                                 .store
                                 .import_secret(
-                                    &secret_name,
+                                    secret_name,
                                     std::mem::take(&mut event.content.secret),
                                 )
                                 .await

matrix_sdk_crypto/src/store/mod.rs

@@ -311,8 +311,8 @@ impl Store {
                         "Successfully imported a private cross signing key"
                     );
 
-                    let mut changes = Changes::default();
-                    changes.private_identity = Some(identity.clone());
+                    let changes =
+                        Changes { private_identity: Some(identity.clone()), ..Default::default() };
 
                     self.save_changes(changes).await?;
                 }