lib-imap: Make sure imap_utf7_to_utf8() doesn't access invalid input string out of bounds.
lib-imap: Make sure imap_utf7_to_utf8() doesn't access invalid input string out of bounds.

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