bcache: Implement strib's PR feedback to clarify the PutWithPrefetch implementation.
bcache: Implement strib's PR feedback to clarify the PutWithPrefetch implementation.

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