apply_ixfr_for_zone
switch(apply_ixfr_for_zone(nsd, zone, df, nsd->options, udb,
int apply_ixfr_for_zone(struct nsd* nsd, zone_type* zone, FILE* in,
} else if(0 >= apply_ixfr_for_zone(xfrd->nsd, dbzone, df,