rtlwifi: Use pci_pcie_cap()

Use function pci_pcie_cap() instead of accessing struct member directly.
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
Tested-by: Larry Finger <Larry.Finger@lwfinger.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/rtlwifi/pci.c

@@ -1608,7 +1608,7 @@ static bool _rtl_pci_find_adapter(struct pci_dev *pdev,
 		pcipriv->ndis_adapter.pcibridge_funcnum =
 		    PCI_FUNC(bridge_pdev->devfn);
 		pcipriv->ndis_adapter.pcibridge_pciehdr_offset =
-		    bridge_pdev->pcie_cap;
+		    pci_pcie_cap(bridge_pdev);
 		pcipriv->ndis_adapter.pcicfg_addrport =
 		    (pcipriv->ndis_adapter.pcibridge_busnum << 16) |
 		    (pcipriv->ndis_adapter.pcibridge_devnum << 11) |