iwlagn: remove rev_id

The rev_id variable is only printed, we
don't need to store it.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/iwlwifi/iwl-agn.c

@@ -3687,8 +3687,10 @@ struct ieee80211_ops iwlagn_hw_ops = {
 
 static u32 iwl_hw_detect(struct iwl_priv *priv)
 {
-	priv->rev_id = priv->pci_dev->revision;
-	IWL_DEBUG_INFO(priv, "HW Revision ID = 0x%X\n", priv->rev_id);
+	u8 rev_id;
+
+	pci_read_config_byte(priv->pci_dev, PCI_REVISION_ID, &rev_id);
+	IWL_DEBUG_INFO(priv, "HW Revision ID = 0x%X\n", rev_id);
 	return _iwl_read32(priv, CSR_HW_REV);
 }
 

drivers/net/wireless/iwlwifi/iwl-dev.h

@@ -1253,7 +1253,6 @@ struct iwl_priv {
 
 	/* pci hardware address support */
 	void __iomem *hw_base;
-	u8   rev_id;
 
 	/* microcode/device supports multiple contexts */
 	u8 valid_contexts;