lib-storage: When mail_location is looked up from environment, set its unexpanded string properly. This fixes a crash when creating index directories and mail location was autodetected.
lib-storage: When mail_location is looked up from environment, set its unexpanded string properly.
This fixes a crash when creating index directories and mail location was
autodetected.

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