[PATCH] VFS documentation tweak

As I was looking over the get_sb() changes, I stumbled across a little
mistake in the documentation updates.  Unless we're getting into an
interesting new object-oriented realm, I doubt that get_sb() should really
return "struct int"...

Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Acked-by: David Howells <dhowells@redhat.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>