deregister_tcp_functions
err = deregister_tcp_functions(&__tcp_bbr, true, false);
err = deregister_tcp_functions(&__tcp_bbr, false, true);
err = deregister_tcp_functions(&__tcp_rack, true, false);
err = deregister_tcp_functions(&__tcp_rack, false, true);
int deregister_tcp_functions(struct tcp_function_block *blk, bool quiesce,