player/Control: Play*() returns Error information

src/player/Control.cxx

@@ -49,18 +49,20 @@ PlayerControl::~PlayerControl()
 	delete tagged_song;
 }
 
-void
-PlayerControl::Play(DetachedSong *song)
+bool
+PlayerControl::Play(DetachedSong *song, Error &error_r)
 {
 	assert(song != nullptr);
 
 	const ScopeLock protect(mutex);
-	SeekLocked(song, SongTime::zero(), IgnoreError());
+	bool success = SeekLocked(song, SongTime::zero(), error_r);
 
-	if (state == PlayerState::PAUSE)
+	if (success && state == PlayerState::PAUSE)
 		/* if the player was paused previously, we need to
 		   unpause it */
 		PauseLocked();
+
+	return success;
 }
 
 void