Fix issue for deadlock when removing gNB context

src/ngap/ngap_app/ngap_app.cpp

@@ -144,6 +144,7 @@ void ngap_app::set_assoc_id_2_gnb_context(
     const sctp_assoc_id_t& assoc_id, std::shared_ptr<gnb_context> gc) {
   std::shared_lock lock(m_assoc2gnbContext);
   assoc2gnbContext[assoc_id] = gc;
+  return;
 }
 
 //------------------------------------------------------------------------------
@@ -164,10 +165,15 @@ void ngap_app::set_gnb_id_2_gnb_context(
     const long& gnb_id, std::shared_ptr<gnb_context> gc) {
   std::unique_lock lock(m_gnbid2gnbContext);
   gnbid2gnbContext[gnb_id] = gc;
+  return;
 }
 
 //------------------------------------------------------------------------------
 void ngap_app::remove_gnb_context(const long& gnb_id) {
-  std::unique_lock lock(m_gnbid2gnbContext);
-  if (is_gnb_id_2_gnb_context(gnb_id)) gnbid2gnbContext.erase(gnb_id);
+
+  if (is_gnb_id_2_gnb_context(gnb_id)) {
+	  std::unique_lock lock(m_gnbid2gnbContext);
+	  gnbid2gnbContext.erase(gnb_id);
+	  return;
+  }
 }