rtw_get_wpa_ie
pbuf = rtw_get_wpa_ie(&pnetwork->network.ies[12], &wpa_ielen, pnetwork->network.ie_length-12);
pbuf = rtw_get_wpa_ie(&bssid->ies[12], &wpa_ielen, bssid->ie_length - 12);
unsigned char *rtw_get_wpa_ie(unsigned char *pie, int *wpa_ie_len, int limit);
pwpa = rtw_get_wpa_ie(buf, &wpa_ielen, ielen);