Cleanup: clang-10 -Wmisleading-indentation

Also, remove some trailing white space and add missing static
qualifier to free_annotate_event().

client/mysqlbinlog.cc

 /*
    Copyright (c) 2000, 2014, Oracle and/or its affiliates.
-   Copyright (c) 2009, 2014, MariaDB
+   Copyright (c) 2009, 2020, MariaDB
 
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
@@ -151,7 +151,7 @@ enum Exit_status {
 */
 static Annotate_rows_log_event *annotate_event= NULL;
 
-void free_annotate_event()
+static void free_annotate_event()
 {
   if (annotate_event)
   {