Do not leak goroutines in ParseTlfHandle on multiple errors
Do not leak goroutines in ParseTlfHandle on multiple errors

The parent only reads one error, so any extra goroutines that wanted
to report an error would hang here.

keybase/client,keybase/kbfs,keybase/client,keybase/client,keybase/client,keybase/kbfs,keybase/client,keybase/client,keybase/client,keybase/kbfs,keybase/client,keybase/client,keybase/kbfs,keybase/client,keybase/client,keybase/client