lib-storage: Don't try to sync private index files if syncing already failed. This fixes a crash when opening a mailbox failed.
lib-storage: Don't try to sync private index files if syncing already failed.
This fixes a crash when opening a mailbox failed.

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