Comment 1 for bug 614227

fix suggestion 2010-07-25:
   45.1 assert(n > 0);

fix reason:
  insert a line to ensure that rs[n] is created with at least 1 element.
  looked for origin of n's value to ensure that it was >= 1.
  found a chain of assumptions that the value is good, without verification.
  current code is brittle, so add assert() for protection.