tinc-up: only write ifconfig lines if both the ifconfig commandline has been configured and a vpn ip has been defined. (change for both ipv4 and ipv6)
tinc-up: only write ifconfig lines if both the ifconfig commandline
has been configured and a vpn ip has been defined.
(change for both ipv4 and ipv6)

ryd/chaosvpn,ryd/chaosvpn,ryd/chaosvpn