PCI PM: Consistently use variable name "error" for pm call return values

I noticed two functions use a variable "i" to store the return value of PM
function calls while the rest of the file uses "error". As "i" normally
indicates a counter of some sort it seems better to keep this consistent.
Signed-off-by: NFrans Pop <elendil@planet.nl>
Signed-off-by: NJesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: NRafael J. Wysocki <rjw@sisk.pl>

drivers/pci/pci-driver.c

@@ -352,17 +352,17 @@ static int pci_legacy_suspend(struct device *dev, pm_message_t state)
 {
 	struct pci_dev * pci_dev = to_pci_dev(dev);
 	struct pci_driver * drv = pci_dev->driver;
-	int i = 0;
+	int error = 0;
 
 	if (drv && drv->suspend) {
 		pci_power_t prev = pci_dev->current_state;
 
 		pci_dev->state_saved = false;
 
-		i = drv->suspend(pci_dev, state);
-		suspend_report_result(drv->suspend, i);
-		if (i)
-			return i;
+		error = drv->suspend(pci_dev, state);
+		suspend_report_result(drv->suspend, error);
+		if (error)
+			return error;
 
 		if (pci_dev->state_saved)
 			goto Fixup;
@@ -385,20 +385,20 @@ static int pci_legacy_suspend(struct device *dev, pm_message_t state)
  Fixup:
 	pci_fixup_device(pci_fixup_suspend, pci_dev);
 
-	return i;
+	return error;
 }
 
 static int pci_legacy_suspend_late(struct device *dev, pm_message_t state)
 {
 	struct pci_dev * pci_dev = to_pci_dev(dev);
 	struct pci_driver * drv = pci_dev->driver;
-	int i = 0;
+	int error = 0;
 
 	if (drv && drv->suspend_late) {
-		i = drv->suspend_late(pci_dev, state);
-		suspend_report_result(drv->suspend_late, i);
+		error = drv->suspend_late(pci_dev, state);
+		suspend_report_result(drv->suspend_late, error);
 	}
-	return i;
+	return error;
 }
 
 static int pci_legacy_resume_early(struct device *dev)