Fix map_clone and explicit truncate when file is create

Signed-off-by: Christian König <ckoenig@posteo.de>

core/src/session.rs

@@ -513,13 +513,7 @@ impl Session {
     }
 
     pub fn get_user_attribute(&self, key: &str) -> Option<String> {
-        self.0
-            .data
-            .read()
-            .user_data
-            .attributes
-            .get(key)
-            .map(Clone::clone)
+        self.0.data.read().user_data.attributes.get(key).cloned()
     }
 
     fn weak(&self) -> SessionWeak {

playback/src/audio_backend/pipe.rs

@@ -66,6 +66,7 @@ impl Sink for StdoutSink {
                     OpenOptions::new()
                         .write(true)
                         .create(true)
+                        .truncate(true)
                         .open(file)
                         .map_err(|e| StdoutError::OpenFailure {
                             file: file.to_string(),