MdeModulePkg/Ip4Dxe: Clean up IP4 interface if failed to open ARP protocol.

This patch fixes a bug in Ip4ConfigProtocol, that new created IP interface is
not freed if Open ARP protocol failed.

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>

MdeModulePkg/Universal/Network/Ip4Dxe/Ip4Impl.c

@@ -727,6 +727,7 @@ Ip4ConfigProtocol (
                     EFI_OPEN_PROTOCOL_BY_CHILD_CONTROLLER
                     );
     if (EFI_ERROR (Status)) {
+      Ip4FreeInterface (IpIf, IpInstance);
       goto ON_ERROR;
     }
   }