--- a/gobm65.go	Sat Apr 07 21:27:59 2018 +0200
+++ b/gobm65.go	Sat Mar 13 19:31:49 2021 +0100
@@ -129,7 +129,7 @@
 			return t, err
 		}
 		//log.Printf("(%d bytes) %q\n", n, b[t:t+1])
-		t = t + n
+		t += n
 	}
 	return t, nil
 }