PCI: Delete unnecessary NULL pointer checks

The functions pci_dev_put(), pci_pme_wakeup_bus(), and put_device() return
immediately if their argument is NULL.  Thus the test before the call is
not needed.

Remove these unnecessary tests.

This issue was detected by using the Coccinelle software.
Signed-off-by: Markus Elfring <elfring@users.sourceforge.net>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>

drivers/pci/pci-acpi.c

@@ -322,7 +322,6 @@ static void pci_acpi_wake_dev(struct work_struct *work)
 	pci_wakeup_event(pci_dev);
 	pm_runtime_resume(&pci_dev->dev);
 
-	if (pci_dev->subordinate)
 	pci_pme_wakeup_bus(pci_dev->subordinate);
 }
 

drivers/pci/probe.c

@@ -87,7 +87,6 @@ static void release_pcibus_dev(struct device *dev)
 {
 	struct pci_bus *pci_bus = to_pci_bus(dev);
 
-	if (pci_bus->bridge)
 	put_device(pci_bus->bridge);
 	pci_bus_remove_resources(pci_bus);
 	pci_release_bus_of_node(pci_bus);

drivers/pci/search.c

@@ -271,7 +271,6 @@ static struct pci_dev *pci_get_dev_by_id(const struct pci_device_id *id,
 			      match_pci_dev_by_id);
 	if (dev)
 		pdev = to_pci_dev(dev);
-	if (from)
 	pci_dev_put(from);
 	return pdev;
 }

drivers/pci/xen-pcifront.c

@@ -596,7 +596,6 @@ static pci_ers_result_t pcifront_common_process(int cmd,
 	pcidev = pci_get_bus_and_slot(bus, devfn);
 	if (!pcidev || !pcidev->driver) {
 		dev_err(&pdev->xdev->dev, "device or AER driver is NULL\n");
-		if (pcidev)
 		pci_dev_put(pcidev);
 		return result;
 	}