Fix media player title count result

src/media_player.rs

@@ -235,7 +235,7 @@ impl MediaPlayer {
     pub fn title_count(&self) -> Option<i32> {
         unsafe{
             let t = sys::libvlc_media_player_get_title_count(self.ptr);
-            if t == -1 { Some(t) } else { None }
+            if t == -1 { None } else { Some(t) }
         }
     }