fixing a message length problem, relates to #689

src/ua_connection.c

@@ -46,7 +46,7 @@ UA_Connection_completeMessages(UA_Connection *connection, UA_ByteString * UA_RES
         memcpy(&data[connection->incompleteMessage.length], message->data, message->length);
         connection->releaseRecvBuffer(connection, message);
         message->data = data;
-        message->length += length;
+        message->length = length;
         *realloced = true;
         connection->incompleteMessage = UA_BYTESTRING_NULL;
     }