RRC: bearer context setup: correctly store DRB QoS params

When setting up bearer(s) through F1, the corresponding F1 message has
QoS fields for the DRB(s) to be set up, as well as for all flows
associated to this DRB. In this commit, set the DRB QoS field to be
equal to the first flow (it is unclear/unspecified how it should be set
up, based on the flows), which was not set before and therefore
contained unitialized data.

The F1 module uses this data, and in split mode, F1 message generation
failed due to uninitialized data.

openair2/RRC/NR/rrc_gNB.c

@@ -2093,6 +2093,7 @@ void rrc_gNB_process_e1_bearer_context_setup_resp(e1ap_bearer_setup_resp_t *resp
 
     /* pass QoS info to MAC */
     int nb_qos_flows = drb_config->numQosFlowSetup;
+    AssertFatal(nb_qos_flows > 0, "must map at least one flow to a DRB\n");
     drbs[i].drb_info.flows_to_be_setup_length = nb_qos_flows;
     drbs[i].drb_info.flows_mapped_to_drb = (f1ap_flows_mapped_to_drb_t *)calloc(nb_qos_flows, sizeof(f1ap_flows_mapped_to_drb_t));
     AssertFatal(drbs[i].drb_info.flows_mapped_to_drb, "could not allocate memory\n");
@@ -2111,6 +2112,9 @@ void rrc_gNB_process_e1_bearer_context_setup_resp(e1ap_bearer_setup_resp_t *resp
         qos_char->non_dynamic.qos_priority_level = in_qos_char->qos_priority;
       }
     }
+    /* the DRB QoS parameters: we just reuse the ones from the first flow */
+    drbs[i].drb_info.drb_qos = drbs[i].drb_info.flows_mapped_to_drb[0].qos_params;
+
     /* pass NSSAI info to MAC */
     drbs[i].nssai = RRC_pduSession->param.nssai;
   }