bugfix for new sf_ahead parameter

targets/RT/USER/lte-ru.c

@@ -3070,7 +3070,7 @@ RU_t **RCconfig_RU(int nb_RU,int nb_L1_inst,PHY_VARS_eNB ***eNB,uint64_t *ru_mas
       ru[j]->nb_rx                             = *(RUParamList.paramarray[j][RU_NB_RX_IDX].uptr);
       ru[j]->att_tx                            = *(RUParamList.paramarray[j][RU_ATT_TX_IDX].uptr);
       ru[j]->att_rx                            = *(RUParamList.paramarray[j][RU_ATT_RX_IDX].uptr);
-      ru[j]->sf_ahead                          = *(RUParamList.paramarray[j][RU_SF_AHEAD_IDX].uptr);
+      ru[j]->sf_ahead                          = *(RUParamList.paramarray[j][RU_SF_AHEAD].uptr);
       *ru_mask= (*ru_mask)|(1<<j);
     }// j=0..num_rus
   }