USB: goku_udc: remove potential null dereference

"dev" is always null here.  In the end it's only used to get the
pci_name() of "pdev" which is redundant information and so I
removed it.
Signed-off-by: NDan Carpenter <error27@gmail.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

drivers/usb/gadget/goku_udc.c

@@ -1768,7 +1768,7 @@ static int goku_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 	 * usb_gadget_driver_{register,unregister}() must change.
 	 */
 	if (the_controller) {
-		WARNING(dev, "ignoring %s\n", pci_name(pdev));
+		pr_warning("ignoring %s\n", pci_name(pdev));
 		return -EBUSY;
 	}
 	if (!pdev->irq) {