Fix the memory leakage.

fujuntang

2021-09-17 97428da8d339d3d0c4d00aa328d76a32c7858412

 src/socket/bus_server_socket.cpp

@@ -849,6 +849,7 @@

    shm_sendto(shm_socket, last_buf, temp + sizeof(int), key, &timeout, BUS_TIMEOUT_FLAG);

    free(last_buf);
  }
}