PCI: pciehp: remove num_slots field

Since PCIe downstream port has only one slot at most, we don't need
num_slots field in struct controller. Note that struct controller
itself doesn't exist if PCIe downstream port has no slot.
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 num_slots;			/* Number of slots on ctlr */
 	int slot_num_inc;		/* 1 or -1 */
 	struct pci_dev *pci_dev;
 	struct pcie_device *pcie;	/* PCI Express port service */

drivers/pci/hotplug/pciehp_hpc.c

@@ -1025,7 +1025,6 @@ struct controller *pcie_init(struct pcie_device *dev)
 	ctrl->slot_cap = slot_cap;
 	ctrl->first_slot = slot_cap >> 19;
 	ctrl->slot_device_offset = 0;
-	ctrl->num_slots = 1;
 	ctrl->hpc_ops = &pciehp_hpc_ops;
 	mutex_init(&ctrl->crit_sect);
 	mutex_init(&ctrl->ctrl_lock);