server_set_instance: allow multiple calls without leaking
server_set_instance: allow multiple calls without leaking

grobian/carbon-c-relay,grobian/carbon-c-relay,piotr1212/carbon-c-relay,piotr1212/carbon-c-relay,piotr1212/carbon-c-relay,piotr1212/carbon-c-relay,grobian/carbon-c-relay