vc-next-action on unregistered files

[Christoph Conrad]

In GNU Emacs 23.0.50 (i386-msvc-nt5.1.2600)
 of 2008-01-11 on CLEOPATRA
Windowing system distributor `Microsoft Corp.', version 5.1.2600
configured using `configure --with-msvc (13.10)'

vc-next-action does not work anymore on unregistered files for me. It
does nothing on "C-x v v". Explicit M-x vc-register works.

in vc-next-action:

     ;; Files aren't registered
     ((not state)
      (mapc 'vc-register files))

state is 'unregistered from previous `vc-state'. So testing (not state)
is obviously wrong.