error in my f/com.c change

[Jeffrey A Law]

  In message < 19971102112305.23626@dot.cygnus.com >you write:
  > In any case, in the attached patch I'm more careful with the type
  > substitutions, only doing it for simple arithmetic that we're likely
  > to get benefit from in the first place.  I also recurse with the 
  > target type, so that expressions like A((I+1)) and A(I*3-1) are
  > handled in sizetype throughout.
Thanks.  I've installed this patch.

jeff