mysql-test/r/ps.result:
  A fix (bug #6089: FOUND_ROWS returns wrong values when no table/view is used).
  The second FOUND_ROWS() should return 1.
sql/sql_class.cc:
  A fix (bug #6089: FOUND_ROWS returns wrong values when no table/view is used).
  limit_found_rows initialization added.
sql/sql_select.cc:
  A fix (bug #6089: FOUND_ROWS returns wrong values when no table/view is used).
  thd->limit_found_rows is set to 1 when no table is used.