cpqphp: Use PCI_CLASS_REVISION instead of PCI_REVISION_ID for read

While PCI_CLASS_REVISION and PCI_REVISION_ID are identical, the
code here discards the revision content and is only interested in
the class number.
Signed-off-by: Auke Kok <auke-jan.h.kok@intel.com>
Cc: Krosten Accardi <kristen.c.accardi@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/pci/hotplug/cpqphp_core.c

@@ -549,7 +549,7 @@ get_slot_mapping(struct pci_bus *bus, u8 bus_num, u8 dev_num, u8 *slot)
 			 * slot. */
 			bus->number = tbus;
 			pci_bus_read_config_dword(bus, PCI_DEVFN(tdevice, 0),
-						PCI_REVISION_ID, &work);
+						PCI_CLASS_REVISION, &work);
 
 			if ((work >> 8) == PCI_TO_PCI_BRIDGE_CLASS) {
 				pci_bus_read_config_dword(bus,