atl1: remove write-only var in tx handler

Signed-off-by: Alexey Dobriyan <adobriyan@sw.ru>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

drivers/net/atl1/atl1_main.c

@@ -634,14 +634,13 @@ static void atl1_intr_tx(struct atl1_adapter *adapter)
 	struct atl1_buffer *buffer_info;
 	u16 sw_tpd_next_to_clean;
 	u16 cmb_tpd_next_to_clean;
-	u8 update = 0;
 
 	sw_tpd_next_to_clean = atomic_read(&tpd_ring->next_to_clean);
 	cmb_tpd_next_to_clean = le16_to_cpu(adapter->cmb.cmb->tpd_cons_idx);
 
 	while (cmb_tpd_next_to_clean != sw_tpd_next_to_clean) {
 		struct tx_packet_desc *tpd;
-		update = 1;
+
 		tpd = ATL1_TPD_DESC(tpd_ring, sw_tpd_next_to_clean);
 		buffer_info = &tpd_ring->buffer_info[sw_tpd_next_to_clean];
 		if (buffer_info->dma) {