Fix: Configure TDD beam association only in FR2; set to NULL otherwise

Before this commit, there was data that was not initialized, resulting
in Msg2 remaining unscheduled.

openair2/LAYER2/NR_MAC_gNB/config.c

@@ -654,11 +654,14 @@ static void config_common(gNB_MAC_INST *nrmac, nr_pdsch_AntennaPorts_t pdsch_Ant
                                               scc->tdd_UL_DL_ConfigurationCommon->pattern1.nrofUplinkSlots,
                                               scc->tdd_UL_DL_ConfigurationCommon->pattern1.nrofUplinkSymbols);
 
-    if (periods_per_frame < 0)
-      LOG_E(NR_MAC, "TDD configuration can not be done\n");
-    else {
-      LOG_I(NR_MAC, "TDD has been properly configurated\n");
-      nrmac->tdd_beam_association = (int16_t *)malloc16(periods_per_frame * sizeof(int16_t));
+    AssertFatal(periods_per_frame > 0, "TDD configuration cannot be configured\n");
+    if (frequency_range == FR2) {
+      LOG_I(NR_MAC, "Configuring TDD beam association to default\n");
+      nrmac->tdd_beam_association = malloc16(periods_per_frame * sizeof(int16_t));
+      for (int i = 0; i < periods_per_frame; ++i)
+        nrmac->tdd_beam_association[i] = -1; /* default: beams not configured */
+    } else {
+      nrmac->tdd_beam_association = NULL; /* default: no beams */
     }
   }