HAMMER_IOC_HISTORY_NEXT_KEY
if (hist.head.flags & HAMMER_IOC_HISTORY_NEXT_KEY)
hist->head.flags &= ~HAMMER_IOC_HISTORY_NEXT_KEY;
HAMMER_IOC_HISTORY_NEXT_KEY |
hist->head.flags |= HAMMER_IOC_HISTORY_NEXT_KEY;
hist->head.flags |= HAMMER_IOC_HISTORY_NEXT_KEY;
if (hist.head.flags & HAMMER_IOC_HISTORY_NEXT_KEY) {