iwlwifi: note that priv->bssid is used only by 3945

The bssid member of struct iwl_priv is now
only used by 3945 code, so note that. It
shouldn't be used by any other code in the
future.
Signed-off-by: NJohannes Berg <johannes.berg@intel.com>
Signed-off-by: NReinette Chatre <reinette.chatre@intel.com>

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

@@ -1210,7 +1210,7 @@ struct iwl_priv {
 #endif
 
 	/* context information */
-	u8 bssid[ETH_ALEN];
+	u8 bssid[ETH_ALEN]; /* used only on 3945 but filled by core */
 	u8 mac_addr[ETH_ALEN];
 
 	/*station table variables */