Support TLSv3 ShangMi cipher suit

Author: ZBCccc

ssl_test.go

@@ -177,18 +177,8 @@ func SimpleConnTest(t testing.TB, constructor func(
 	t testing.TB, conn1, conn2 net.Conn) (sslconn1, sslconn2 HandshakingConn)) {
 	// Create network pipe
 	serverConn, clientConn := NetPipe(t)
-	defer func(serverConn net.Conn) {
-		err := serverConn.Close()
-		if err != nil {
-			t.Fatal(err)
-		}
-	}(serverConn)
-	defer func(clientConn net.Conn) {
-		err := clientConn.Close()
-		if err != nil {
-			t.Fatal(err)
-		}
-	}(clientConn)
+	defer serverConn.Close()
+	defer clientConn.Close()
 
 	data := "first test string\n"
 
@@ -226,11 +216,7 @@ func SimpleConnTest(t testing.TB, constructor func(
 	// Server goroutine
 	go func() {
 		defer wg.Done()
-		defer func() {
-			if err := server.Close(); err != nil {
-				t.Fatal("server close error: ", err)
-			}
-		}()
+		defer server.Close()
 
 		// Perform handshake
 		err := server.Handshake()