igc: Remove dead code related to flower filter

IGC driver has no support for tc-flower filters so this patch removes
some leftover code, probably copied from IGB driver by mistake.
Signed-off-by: Andre Guedes <andre.guedes@intel.com>
Tested-by: Aaron Brown <aaron.f.brown@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

drivers/net/ethernet/intel/igc/igc.h

@@ -185,7 +185,6 @@ struct igc_adapter {
 
 	/* RX network flow classification support */
 	struct hlist_head nfc_filter_list;
-	struct hlist_head cls_flower_list;
 	unsigned int nfc_filter_count;
 
 	/* lock for RX network flow classification filter */

drivers/net/ethernet/intel/igc/igc_main.c

@@ -3487,9 +3487,6 @@ static void igc_nfc_filter_exit(struct igc_adapter *adapter)
 	hlist_for_each_entry(rule, &adapter->nfc_filter_list, nfc_node)
 		igc_erase_filter(adapter, rule);
 
-	hlist_for_each_entry(rule, &adapter->cls_flower_list, nfc_node)
-		igc_erase_filter(adapter, rule);
-
 	spin_unlock(&adapter->nfc_lock);
 }