Don't read the revision ID unnecessary since the PCI subsystem
fills this field in already.

Updated to fix a thinko bug in a previously sent patch.
Signed-off-by: NAuke Kok <auke-jan.h.kok@intel.com>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>