PCI: Remove unnecessary list_empty(&pci_pme_list) check

list_for_each_entry() handles empty lists just fine, so there's no need to
check whether the list is empty first.

No functional change.
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Rafael J. Wysocki <rjw@rjwysocki.net>

drivers/pci/pci.c

@@ -1611,7 +1611,6 @@ static void pci_pme_list_scan(struct work_struct *work)
 	struct pci_pme_device *pme_dev, *n;
 
 	mutex_lock(&pci_pme_list_mutex);
-	if (!list_empty(&pci_pme_list)) {
 	list_for_each_entry_safe(pme_dev, n, &pci_pme_list, list) {
 		if (pme_dev->dev->pme_poll) {
 			struct pci_dev *bridge;
@@ -1633,7 +1632,6 @@ static void pci_pme_list_scan(struct work_struct *work)
 	if (!list_empty(&pci_pme_list))
 		schedule_delayed_work(&pci_pme_work,
 				      msecs_to_jiffies(PME_TIMEOUT));
-	}
 	mutex_unlock(&pci_pme_list_mutex);
 }