PCI: Drop pci_device_probe() test of !pci_dev->driver

When the device core calls the .probe() callback for a device, the device
is never bound, so pci_dev->driver is always NULL.

Remove the unnecessary test of !pci_dev->driver.

Link: https://lore.kernel.org/r/20211004125935.2300113-3-u.kleine-koenig@pengutronix.deSigned-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>

drivers/pci/pci-driver.c

@@ -397,7 +397,7 @@ static int __pci_device_probe(struct pci_driver *drv, struct pci_dev *pci_dev)
 	const struct pci_device_id *id;
 	int error = 0;
 
-	if (!pci_dev->driver && drv->probe) {
+	if (drv->probe) {
 		error = -ENODEV;
 
 		id = pci_match_device(drv, pci_dev);