bcache: Fix so that permanent entry accounting still works beyond the capacity of the cache.
bcache: Fix so that permanent entry accounting still works beyond the capacity of the cache.

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