re: dlls/msi/streams.c -- simplify and constify

[Dan Kegel]

James wrote:
> This change is wrong.  If you'd actually read what the code intended
> to do instead of just fixing warnings, you'd see that
> add_streams_to_table returns -1 on error.

Yeah, Gerald, I was getting the feeling reading your
patches that you were being too glib about rewriting
code based simply on looking at signedness issues.
Please be more careful.
- Dan