PlayAudioFile never returns when not ready

[jD91mZM2]

When you return at https://github.com/bwmarrin/dgvoice/blob/master/dgvoice.go#L116, which means https://github.com/bwmarrin/dgvoice/blob/master/dgvoice.go#L195 waits forever, and never returns. I'd suggest closing the channel or something

[jD91mZM2]

Another thing, printing an error there is not the best of ideas. Because everytime PlayAudioFile closes, it throws an error because SendPCM continues to live on.

[bwmarrin]

I think there's a lot of room for improvement here :)