igc: Clean up unused shadow_vfta pointer

VLAN filter table array not implemented yet and shadow_vfta pointer
not used. Clean up the code and remove the unused shadow_vfta pointer.
Signed-off-by: Sasha Neftin <sasha.neftin@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

@@ -411,7 +411,6 @@ struct igc_adapter {
 	u32 tx_hwtstamp_timeouts;
 	u32 tx_hwtstamp_skipped;
 	u32 rx_hwtstamp_cleared;
-	u32 *shadow_vfta;
 
 	u32 rss_queues;
 	u32 rss_indir_tbl_init;

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

@@ -4573,7 +4573,6 @@ static void igc_remove(struct pci_dev *pdev)
 	pci_release_mem_regions(pdev);
 
 	kfree(adapter->mac_table);
-	kfree(adapter->shadow_vfta);
 	free_netdev(netdev);
 
 	pci_disable_pcie_error_reporting(pdev);