1507 followups

[TheBlueMatt]

A bunch of trivial things, but also one memory leak that now needs fixed for 114 - #1507 (review)

[TheBlueMatt]

Also, we should go through the cases where we set APIMisuseError for methods where we don't find the peer and make sure it shouldn't instead be ChannelUnavailable. #1939 (comment)