i40e: remove duplicate stat calculation for tx_errors

The tx_errors statistic was being calculated twice in
i40e_update_eth_stats.

This appears to be as of commit 201db2898f2c ("i40e: add missing VSI
statistics", 2014-03-25).

Remove the extra i40e_stat_update32 call for GLV_TEPC.
Signed-off-by: Jacob Keller <jacob.e.keller@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

drivers/net/ethernet/intel/i40e/i40e_main.c

@@ -636,9 +636,6 @@ void i40e_update_eth_stats(struct i40e_vsi *vsi)
 	i40e_stat_update32(hw, I40E_GLV_RUPP(stat_idx),
 			   vsi->stat_offsets_loaded,
 			   &oes->rx_unknown_protocol, &es->rx_unknown_protocol);
-	i40e_stat_update32(hw, I40E_GLV_TEPC(stat_idx),
-			   vsi->stat_offsets_loaded,
-			   &oes->tx_errors, &es->tx_errors);
 
 	i40e_stat_update48(hw, I40E_GLV_GORCH(stat_idx),
 			   I40E_GLV_GORCL(stat_idx),