[dovecot/core] 13f507: quota: Don't log "Internal quota calculation error...

[GitHub]

  Branch: refs/heads/master
  Home:   https://github.com/dovecot/core
  Commit: 13f507c0df27fee7b30cb965574e077a22606502
      https://github.com/dovecot/core/commit/13f507c0df27fee7b30cb965574e077a22606502
  Author: Timo Sirainen <timo.sirainen at dovecot.fi>
  Date:   2017-02-22 (Wed, 22 Feb 2017)

  Changed paths:
    M src/plugins/quota/quota-storage.c

  Log Message:
  -----------
  quota: Don't log "Internal quota calculation error"

It's not very informative and we can't give a better error message without
changing the APIs. The real error should have been logged already anyway,
so this is just duplication of an error. I think originally this was added
because some backend forgot to log an error.