Fix initialisation problem.
Found that new structure parmaeter ext_buf_assigned needs to be
initialised to false in lv_chart_add_series() as sometimes is set true
depending on what was previously in the heap where it was allocated.
@@ -191,6 +191,7 @@ lv_chart_series_t * lv_chart_add_series(lv_obj_t * chart, lv_color_t color)
}
ser->start_point = 0;
+ ser->ext_buf_assigned = false;
uint16_t i;
lv_coord_t * p_tmp = ser->points;
