usb: dwc3: Fix NULL pointer exception in dwc3_pci_remove()

In dwc3_pci_quirks() function, gpiod lookup table is only registered for
baytrail SOC. But in dwc3_pci_remove(), we try to unregistered it
without any checks. This leads to NULL pointer de-reference exception in
gpiod_remove_lookup_table() when unloading the module for non baytrail
SOCs. This patch fixes this issue.

Fixes: 5741022c ("usb: dwc3: pci: Add GPIO lookup table on platforms
without ACPI GPIO resources")
Cc: <stable@vger.kernel.org>
Signed-off-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com>
Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>

drivers/usb/dwc3/dwc3-pci.c

@@ -283,8 +283,10 @@ static int dwc3_pci_probe(struct pci_dev *pci, const struct pci_device_id *id)
 static void dwc3_pci_remove(struct pci_dev *pci)
 {
 	struct dwc3_pci		*dwc = pci_get_drvdata(pci);
+	struct pci_dev		*pdev = dwc->pci;
 
-	gpiod_remove_lookup_table(&platform_bytcr_gpios);
+	if (pdev->device == PCI_DEVICE_ID_INTEL_BYT)
+		gpiod_remove_lookup_table(&platform_bytcr_gpios);
 #ifdef CONFIG_PM
 	cancel_work_sync(&dwc->wakeup_work);
 #endif