no need to zero-initialize mysql->master->{rpl_pivot, options.rpl_parse,

options.rpl_probe} as they are zero-initialized in spawn_init()

libmysql/libmysql.c

@@ -2289,9 +2289,6 @@ STDCALL mysql_set_master(MYSQL* mysql, const char* host,
     mysql_close(mysql->master);
   if (!(mysql->master = spawn_init(mysql, host, port, user, passwd)))
     return 1;
-  mysql->master->rpl_pivot = 0;
-  mysql->master->options.rpl_parse = 0;
-  mysql->master->options.rpl_probe = 0;
   return 0;
 }