XP_BZERO(&message_data, sizeof(IL_GroupMessageData));
nsCRT::zero(&message_data, sizeof(IL_GroupMessageData));
il_group_notify(IL_GroupContext *img_cx, XP_ObservableMsg message){    IL_GroupMessageData message_data;        XP_BZERO(&message_data, sizeof(IL_GroupMessageData));        /* Fill in the message data and notify observers. */    message_data.display_context = img_cx->dpy_cx;    message_data.image_context = img_cx;    XP_NotifyObservers(img_cx->obs_list, message, &message_data);}