tlm_unget_read_buffer
extern void tlm_unget_read_buffer(tlm_buffers_t *, int);
tlm_unget_read_buffer(lcmd->tc_buffers, actual_size);
tlm_unget_read_buffer(lcmd->tc_buffers, sz - size);
tlm_unget_read_buffer(lcmd->tc_buffers, actual_size);
tlm_unget_read_buffer(lcmd->tc_buffers, actual_size);