stream_bluray: fix for significant memory leak

It's obvious but, since STREAM_CTRL_GET_TIME_LENGTH is called
frequently, the amount of leaked memory here is quite big.

stream/stream_bluray.c

@@ -187,6 +187,7 @@ static int bluray_stream_control(stream_t *s, int cmd, void *arg)
             return STREAM_UNSUPPORTED;
 
         *((double *) arg) = BD_TIME_TO_MP(ti->duration);
+        bd_free_title_info(ti);
         return STREAM_OK;
     }