for (i = 0; i <= av_len(padn); ++i) {
    HE *hent;
    SV **nameptr = av_fetch(padn, i, 0);
    if (nameptr != NULL && SvPOKp(*nameptr) 
     && (hent = hv_fetch_ent(hvn, *nameptr, 0, 0)) != NULL) {
        /* do something interesting with the value from hent */
    }
}