GitLab

- distinguish log.Error and log.Errorf functions
- Initialize structs with field names
- A bit of unreachable code (defers)

until https://github.com/op/go-logging/pull/30 is merged

not internal since io needs it

fix(fuse/ipns) use pb package

fix(fuse) import protos from unixfs/pb package

cc @whyrusleeping

cc @jbenet