force use of ipv4 in test

License: MIT
Signed-off-by: Jeromy <jeromyj@gmail.com>

p2p/net/swarm/dial_test.go

@@ -89,7 +89,7 @@ func TestSimultDials(t *testing.T) {
 
 func newSilentPeer(t *testing.T) (peer.ID, ma.Multiaddr, net.Listener) {
 	dst := testutil.RandPeerIDFatal(t)
-	lst, err := net.Listen("tcp", ":0")
+	lst, err := net.Listen("tcp4", "0.0.0.0:0")
 	if err != nil {
 		t.Fatal(err)
 	}