failures)

Fixed open_performance_schema_table() and close_performance_schema_table()
implementation and callers, to always execute balanced calls to:
  thd->reset_n_backup_open_tables_state(backup);
  thd->restore_backup_open_tables_state(backup);



sql/log.cc:
  Balanced calls to reset_n_backup_open_tables_state() / restore_backup_open_tables_state()
sql/sql_base.cc:
  Balanced calls to reset_n_backup_open_tables_state() / restore_backup_open_tables_state()