Some corrections for initial mode

[mlgd]

No description provided.

[davecheney]

exposed is never false unless expose() fails

[mlgd]

exposed is set to true if GPIO port is already opened :

func expose(pin int) (string, bool, error) {
exposed := false
pinBase := filepath.Join(gpiobase, fmt.Sprintf("gpio%d", pin))
var err error
if _, statErr := os.Stat(pinBase); os.IsNotExist(statErr) {
err = writeFile(exportPath, "%d", pin)
} else {
exposed = true
}
return pinBase, exposed, err
}

[davecheney]

Thanks for your change. As you've probably discovered, this repo is long dead. I'm happy to merge this change once you've addressed my comments, but you may find it easier to fork and run. I won't take it personally :)