A police sergeant who has been waiting for more than 22 months to challenge his suspension got the go-ahead to pursue a due process claim against the city of Chicago.Stephen Franko’s September 2016 suspension for allegedly lying in the Laquan McDonald shooting investigation was stayed by a federal judge after nine months.He’s been back at work earning a paycheck since June 2017, but his challenge to the initial suspension remains unresolved. Franko contends that’s a violation of due process.In a written …