CID 1465290: Passing null pointer "ipv4_addr" to "geoip_get_country_by_addr"

*** CID 1465290:  Null pointer dereferences  (FORWARD_NULL)
/src/feature/nodelist/nodelist.c: 1991 in node_set_country()
1985       /* XXXXipv6 */
1986       if (node->rs)
1987         ipv4_addr = &node->rs->ipv4_addr;
1988       else if (node->ri)
1989         ipv4_addr = &node->ri->ipv4_addr;
1990     
>>>     CID 1465290:  Null pointer dereferences  (FORWARD_NULL)
>>>     Passing null pointer "ipv4_addr" to "geoip_get_country_by_addr", which dereferences it.
1991       node->country = geoip_get_country_by_addr(ipv4_addr);
1992     }
1993     
1994     /** Set the country code of all routers in the routerlist. */
1995     void
1996     nodelist_refresh_countries(void)