Fix Coverity Scan CID 300460 (Using uninitialized value fp->eutra_band when calling from_earfcn.)

nfapi/oai_integration/nfapi_pnf.c

@@ -540,6 +540,7 @@ int config_request(nfapi_pnf_config_t *config, nfapi_pnf_phy_config_t *phy, nfap
   }
 
   if(req->nfapi_config.earfcn.tl.tag == NFAPI_NFAPI_EARFCN_TAG) {
+    fp->eutra_band = 0;
     fp->dl_CarrierFreq = from_earfcn(fp->eutra_band, req->nfapi_config.earfcn.value);
     fp->ul_CarrierFreq = fp->dl_CarrierFreq - (get_uldl_offset(fp->eutra_band) * 1e5);
     num_tlv++;