fix close signature

conn.go

@@ -25,7 +25,7 @@ type conn struct {
 var _ tpt.Conn = &conn{}
 
 func (c *conn) Close() error {
-	return c.sess.Close(nil)
+	return c.sess.Close()
 }
 
 // IsClosed returns whether a connection is fully closed.

listener.go

@@ -57,7 +57,7 @@ func (l *listener) Accept() (tpt.Conn, error) {
 		}
 		conn, err := l.setupConn(sess)
 		if err != nil {
-			sess.Close(err)
+			sess.CloseWithError(0, err)
 			continue
 		}
 		return conn, nil