wgengine/router: fix go vet failure on BSDs
@@ -130,7 +130,7 @@ func (r *userspaceBSDRouter) Set(cfg *Config) (reterr error) {
// https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=218508
// Instead add our whole /48, which works because we use a /48 route.
// Full history: https://github.com/tailscale/tailscale/issues/1307
- tmp := netaddr.IPPrefix{addr.IP, 48}
+ tmp := netaddr.IPPrefix{IP: addr.IP, Bits: 48}
arg = []string{"ifconfig", r.tunname, inet(tmp), tmp.String()}
} else {
arg = []string{"ifconfig", r.tunname, inet(addr), addr.String(), addr.IP.String()}
