ext2 and cramfs don't seem to do modules right

[Jeff Dike]

With ext2, a #ifdef MODULE was lost around the unregister_filesystem call.  Unfortunately, the unregister_filesystem definition is inside a #ifdef CONFIG_MODULES.

With cramfs, I don't think it matters too much, given the nature of the filesystem, but I though I'd mention it.

I did a quick check of all the others and they look ok.

				Jeff