Function usage

lib_rpc/samples/http_rpc_client/http_rpc_client.cpp:125–131

}

static void usage(const char* procname)
{
	printf("usage: %s -h [help]\r\n"
		"-s server_addr [default: 127.0.0.1:8888]\r\n"
		"-n max_request\r\n"
		"-m [use_mempool, default: false]\r\n", procname);
}

int main(int argc, char* argv[])
{