[PATCH] pci: initialize struct pci_dev.error_state

The pci channel state is currently uninitialized, thus there are two ways
of indicating that "everything's OK": 0 and 1.  This is a bit of a burden.

If a devce driver wants to check if the pci channel is in a working or a
disconnected state, the driver writer must perform checks similar to

   if((pdev->error_state != 0) &&
      (pdev->error_state != pci_channel_io_normal)) {
         whatever();
   }

which is rather akward.  The first check is needed because stuct pci_dev is
inited to all-zeros.  The scond is needed because the error recovery will
set the state to pci_channel_io_normal (which is not zero).

This patch fixes this awkwardness.

Signed-off-by: Linas Vepstas <linas@austin.ibm.com>
Cc: Greg KH <greg@kroah.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>