iwlegacy: remove unnecessary read of PCI_CAP_ID_EXP

The PCIE capability offset is saved during PCI bus walking.  It will
remove an unnecessary search in the PCI configuration space if this
value is referenced instead of reacquiring it.
Signed-off-by: NJon Mason <jdmason@kudzu.us>
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>

drivers/net/wireless/iwlegacy/iwl-core.h

@@ -484,7 +484,7 @@ static inline u16 iwl_legacy_pcie_link_ctl(struct iwl_priv *priv)
 {
 	int pos;
 	u16 pci_lnk_ctl;
-	pos = pci_find_capability(priv->pci_dev, PCI_CAP_ID_EXP);
+	pos = pci_pcie_cap(priv->pci_dev);
 	pci_read_config_word(priv->pci_dev, pos + PCI_EXP_LNKCTL, &pci_lnk_ctl);
 	return pci_lnk_ctl;
 }