Bad format in function.c

In the current CVS, these two calls to `fatal' in
function.c:define_new_function:

  if (min < 0 || min > 255)
    fatal (flocp, _("Invalid minimum argument count (%d) for function %s%s\n"),
           min, name);
  if (max < 0 || max > 255 || max < min)
    fatal (flocp, _("Invalid maximum argument count (%d) for function %s%s\n"),
           max, name);

trigger compiler warnings about too many arguments, because of the
second %s.  Is this simply a typo in the format string, or was a 3rd
argument planned?  If the latter, what is that 3rd arg?