You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: config.go
    path of file: ./repos/heketi/server/config
    
    the code of the file until where you have to start completion: //
// Copyright (c) 2018 The heketi Authors
//
// This file is licensed to you under your cho
    
func ReadConfig(configfile string) (config *Config, e error) {
	fp, e := os.Open(configfile)
	if e != nil {
		fmt.Fprintf(os.Stderr,
			"ERROR: Unable to open config file %v: %v\n",
			configfile,
			e.Error())
		return
	}
	defer fp.Close()
	return ParseConfig(fp)
}