fix segfault when using RC.rrc if it is RRU

targets/RT/USER/lte-softmodem.c

@@ -613,6 +613,7 @@ int main( int argc, char **argv ) {
 #endif
   int CC_id = 0;
   int ru_id;
+  int node_type = ngran_eNB;
 #if defined (XFORMS)
   int ret;
 #endif
@@ -696,12 +697,13 @@ int main( int argc, char **argv ) {
       RRC_CONFIGURATION_REQ(msg_p) = RC.rrc[enb_id]->configuration;
       itti_send_msg_to_task (TASK_RRC_ENB, ENB_MODULE_ID_TO_INSTANCE(enb_id), msg_p);
     }
+    node_type = RC.rrc[0]->node_type;
   } else {
     printf("RC.nb_inst = 0, Initializing L1\n");
     RCconfig_L1();
   }
 
-  if (RC.nb_inst > 0 && NODE_IS_CU(RC.rrc[0]->node_type)) {
+  if (RC.nb_inst > 0 && NODE_IS_CU(node_type)) {
     protocol_ctxt_t ctxt;
     ctxt.module_id = 0 ;
     ctxt.instance = 0;
@@ -711,7 +713,7 @@ int main( int argc, char **argv ) {
   }
 
   /* start threads if only L1 or not a CU */
-  if (RC.nb_inst == 0 || !NODE_IS_CU(RC.rrc[0]->node_type)) {
+  if (RC.nb_inst == 0 || !NODE_IS_CU(node_type)) {
     // init UE_PF_PO and mutex lock
     pthread_mutex_init(&ue_pf_po_mutex, NULL);
     memset (&UE_PF_PO[0][0], 0, sizeof(UE_PF_PO_t)*MAX_MOBILES_PER_ENB*MAX_NUM_CCs);
@@ -844,7 +846,7 @@ int main( int argc, char **argv ) {
   LOG_I(ENB_APP,"oai_exit=%d\n",oai_exit);
   // stop threads
 
-  if (RC.nb_inst == 0 || !NODE_IS_CU(RC.rrc[0]->node_type)) {
+  if (RC.nb_inst == 0 || !NODE_IS_CU(node_type)) {
     int UE_id;
 #ifdef XFORMS
     printf("waiting for XFORMS thread\n");