Potential leak for gst_bus_add_watch
In the channel-display-gst.c
bus = gst_pipeline_get_bus(GST_PIPELINE(decoder->pipeline));
gst_bus_add_watch(bus, handle_pipeline_message, decoder);
gst_object_unref(bus);
the gst_bus_add_watch's bus id not be free,which will be cause gst_poll_read_controll assert error.