fix(net/multiconn) data race in test

https://build.protocol-dev.com/job/go-ipfs.test.go.race.nofuse/276/console

License: MIT
Signed-off-by: Brian Tiger Chow <brian@perfmode.com>

net/conn/multiconn.go

@@ -262,6 +262,16 @@ func (c *MultiConn) ID() string {
 	return string(ids)
 }
 
+func (c *MultiConn) Conns() []Conn {
+	c.RLock()
+	defer c.RUnlock()
+	var conns []Conn
+	for _, c := range c.conns {
+		conns = append(conns, c)
+	}
+	return conns
+}
+
 func (c *MultiConn) String() string {
 	return String(c, "MultiConn")
 }

net/conn/multiconn_test.go

@@ -307,11 +307,11 @@ func TestMulticonnClose(t *testing.T) {
 	ctx := context.Background()
 	c1, c2 := setupMultiConns(t, ctx)
 
-	for _, c := range c1.conns {
+	for _, c := range c1.Conns() {
 		c.Close()
 	}
 
-	for _, c := range c2.conns {
+	for _, c := range c2.Conns() {
 		c.Close()
 	}