quota: Mark the mailbox deleted before starting to reduce quota. This fixes race conditions with another process modifying the same mailbox at the same time.
quota: Mark the mailbox deleted before starting to reduce quota.
This fixes race conditions with another process modifying the same mailbox
at the same time.

jwm/dovecot-notmuch,jwm/dovecot-notmuch,jkerihuel/dovecot,jkerihuel/dovecot,jwm/dovecot-notmuch,jkerihuel/dovecot,jkerihuel/dovecot,jkerihuel/dovecot,jwm/dovecot-notmuch,jwm/dovecot-notmuch