Instance->Dhcp4Event is not necessary to be created in Ip4Config2InitInstance. Because it will created in Ip4StartAutoConfig() later. Reviewed-by: Ye Ting <ting.ye@intel.com> Reviewed-by: Wu Jiaxin <jiaxin.wu@intel.com> Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Fu Siyuan <siyuan.fu@intel.com>