go.net/ipv6: don't set non-working parameters in test

LGTM=iant
R=iant
CC=golang-codereviews
https://golang.org/cl/172720043

ipv6/readwrite_test.go

@@ -133,7 +133,6 @@ func TestPacketConnConcurrentReadWriteUnicastUDP(t *testing.T) {
 		cm := ipv6.ControlMessage{
 			TrafficClass: DiffServAF11 | CongestionExperienced,
 			Src:          net.IPv6loopback,
-			Dst:          net.IPv6loopback,
 		}
 		if ifi != nil {
 			cm.IfIndex = ifi.Index

ipv6/unicast_test.go

@@ -39,7 +39,6 @@ func TestPacketConnReadWriteUnicastUDP(t *testing.T) {
 	cm := ipv6.ControlMessage{
 		TrafficClass: DiffServAF11 | CongestionExperienced,
 		Src:          net.IPv6loopback,
-		Dst:          net.IPv6loopback,
 	}
 	cf := ipv6.FlagTrafficClass | ipv6.FlagHopLimit | ipv6.FlagSrc | ipv6.FlagDst | ipv6.FlagInterface | ipv6.FlagPathMTU
 	ifi := loopbackInterface()
@@ -104,7 +103,6 @@ func TestPacketConnReadWriteUnicastICMP(t *testing.T) {
 	cm := ipv6.ControlMessage{
 		TrafficClass: DiffServAF11 | CongestionExperienced,
 		Src:          net.IPv6loopback,
-		Dst:          net.IPv6loopback,
 	}
 	cf := ipv6.FlagTrafficClass | ipv6.FlagHopLimit | ipv6.FlagSrc | ipv6.FlagDst | ipv6.FlagInterface | ipv6.FlagPathMTU
 	ifi := loopbackInterface()