PCI: pciehp: remove slot_num_inc field

The slot_num_inc field in struct controller is unused and meaningless
in pciehp driver.

Acked-by: Alex Chiang <achiang@hp.com>
Signed-off-by: Kenji Kaneshige <kaneshige.kenji@jp.fujitsu.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>

drivers/pci/hotplug/pciehp.h

@@ -93,7 +93,6 @@ struct event_info {
 struct controller {
 	struct mutex crit_sect;		/* critical section mutex */
 	struct mutex ctrl_lock;		/* controller lock */
-	int slot_num_inc;		/* 1 or -1 */
 	struct pci_dev *pci_dev;
 	struct pcie_device *pcie;	/* PCI Express port service */
 	struct slot *slot;