Make multiple cylinders actually work

Make multiple cylinders actually work

This just always shows two cylinders, which is obviously bogus, but it's
a good test-case for the multi-cylinder case.

I need to figure out how to dynamically show the right number of
cylinders, but that also involves the notion of adding a cylinder in
order to fill out information that didn't use to exist.

That's lower priority - now the infrastructure seems to be there.

Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>