Not a function

src/freedombone-controlpanel

     echo -n "IPv4: $(get_ipv4_address)"
     ipv6_address="$(get_ipv6_address)"
     if [ ${#ipv6_address} -gt 0 ]; then
-        echo "    IPv6: $(ipv6_address)"
+        echo "    IPv6: ${ipv6_address}"
     fi
     echo ''
     echo ''