- no need for link0 any more, we have separate tap interfaces
- fix memory leak (gc is unused)

Index: src/openvpn/tun.c
--- src/openvpn/tun.c.orig
+++ src/openvpn/tun.c
@@ -1376,21 +1376,26 @@ do_ifconfig_ipv4(struct tuntap *tt, const char *ifname
     if (tun)
     {
         argv_printf(&argv,
-                    "%s %s %s %s mtu %d netmask 255.255.255.255 up -link0",
+                    "%s %s %s %s mtu %d netmask 255.255.255.255 up",
                     IFCONFIG_PATH, ifname, ifconfig_local,
                     ifconfig_remote_netmask, tun_mtu);
     }
     else if (tt->type == DEV_TYPE_TUN && tt->topology == TOP_SUBNET)
     {
         remote_end = create_arbitrary_remote( tt );
-        argv_printf(&argv, "%s %s %s %s mtu %d netmask %s up -link0",
+        argv_printf(&argv, "%s %s %s %s mtu %d netmask %s up",
                     IFCONFIG_PATH, ifname, ifconfig_local,
                     print_in_addr_t(remote_end, 0, &gc), tun_mtu,
                     ifconfig_remote_netmask);
     }
     else
     {
-        argv_printf(&argv, "%s %s %s netmask %s mtu %d link0",
+        /*
+         * OpenBSD has distinct tun and tap devices
+         * so we don't need the "link0" extra parameter to specify we want to do
+         * tunneling at the ethernet level
+         */
+        argv_printf(&argv, "%s %s %s netmask %s mtu %d",
                     IFCONFIG_PATH, ifname, ifconfig_local,
                     ifconfig_remote_netmask, tun_mtu);
     }