message: clippy: fix if_let_redundant_pattern_matching warnings
diff: @@ -175,7 +175,7 @@ impl ManagedDirectory {
  managed_paths_write.remove(delete_file);
  }
  }
  - if let Err(_) = save_managed_paths(self.directory.as_mut(), &meta_informations_wlock) {
  + if save_managed_paths(self.directory.as_mut(), &meta_informations_wlock).is_err() {
  error!("Failed to save the list of managed files.");
  }
  }
  