i40e: fix invalid void return in FCoE code

A function was calling i40e_tx_map with return, but tx_map returns
void, and the caller returns void, so just drop the return, and
everything is good.

Change-ID: I53fc676d517864761e7cbb8ca83f1ef0c15b1f8f
Signed-off-by: NJesse Brandeburg <jesse.brandeburg@intel.com>
Tested-by: NJim Young <james.m.young@intel.com>
Signed-off-by: NJeff Kirsher <jeffrey.t.kirsher@intel.com>

drivers/net/ethernet/intel/i40e/i40e_fcoe.c

@@ -1306,8 +1306,7 @@ static void i40e_fcoe_tx_map(struct i40e_ring *tx_ring,
 	/* MACLEN is ether header length in words not bytes */
 	td_offset |= (maclen >> 1) << I40E_TX_DESC_LENGTH_MACLEN_SHIFT;
 
-	return i40e_tx_map(tx_ring, skb, first, tx_flags, hdr_len,
-			   td_cmd, td_offset);
+	i40e_tx_map(tx_ring, skb, first, tx_flags, hdr_len, td_cmd, td_offset);
 }
 
 /**