fix unitialised value

srsenb/src/phy/sf_worker.cc

@@ -646,10 +646,8 @@ int sf_worker::decode_pusch(stack_interface_phy_lte::ul_sched_grant_t* grants, u
 
 int sf_worker::decode_pucch()
 {
-  srslte_pucch_res_t pucch_res;
-  ZERO_OBJECT(pucch_res);
-
   for (std::map<uint16_t, ue*>::iterator iter = ue_db.begin(); iter != ue_db.end(); ++iter) {
+    srslte_pucch_res_t pucch_res = {};
     uint16_t           rnti      = (uint16_t)iter->first;
 
     // If it's a User RNTI and doesn't have PUSCH grant in this TTI