lib-ssl-iostream: Don't assert-crash if stream buffer gets full.
lib-ssl-iostream: Don't assert-crash if stream buffer gets full.

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