Add missing return statement to set_log_level()

[korydraughn]

Bug Report

irods_client_s3_api/core/src/main.cpp

Lines 562 to 568 in efdad5b

	const auto iter = _config.find("log_level");
	if (iter == std::end(_config)) {
	spdlog::set_level(spdlog::level::info);
	}
	const auto& lvl_string = iter->get_ref<const std::string&>();

Pretty sure we just need to do this:

	if (iter == std::end(_config)) {
		spdlog::set_level(spdlog::level::info);
+		return;
	}