added a function to delete external namespaces to the server --> fixes a

memleak when using external namespaces

src/server/ua_server.c

@@ -59,6 +59,17 @@ static void UA_ExternalNamespace_deleteMembers(UA_ExternalNamespace *ens) {
     ens->externalNodeStore.destroy(ens->externalNodeStore.ensHandle);
 }
 
+static void UA_Server_deleteExternalNamespaces(UA_Server *server){
+	for(UA_UInt32 i = 0; i < server->externalNamespacesSize; i++){
+		UA_ExternalNamespace_deleteMembers(&(server->externalNamespaces[i]));
+	}
+	if(server->externalNamespacesSize > 0){
+		UA_free(server->externalNamespaces);
+		server->externalNamespaces = UA_NULL;
+		server->externalNamespacesSize = 0;
+	}
+}
+
 UA_StatusCode UA_EXPORT UA_Server_addExternalNamespace(UA_Server *server, UA_UInt16 namespaceIndex,
                                                        const UA_String *url, UA_ExternalNodeStore *nodeStore) {
 	if(nodeStore == UA_NULL)
@@ -146,6 +157,9 @@ void UA_Server_delete(UA_Server *server) {
     UA_SecureChannelManager_deleteMembers(&server->secureChannelManager);
     UA_SessionManager_deleteMembers(&server->sessionManager);
     UA_NodeStore_delete(server->nodestore);
+#ifdef UA_EXTERNAL_NAMESPACES
+    UA_Server_deleteExternalNamespaces(server);
+#endif
     UA_ByteString_deleteMembers(&server->serverCertificate);
     UA_Array_delete(server->namespaces, &UA_TYPES[UA_TYPES_STRING], server->namespacesSize);
     UA_Array_delete(server->endpointDescriptions, &UA_TYPES[UA_TYPES_ENDPOINTDESCRIPTION],