sundance: remove unused variable cnt

Variable cnt is just being incremented and it's never used
anywhere else. The variable and the increment are redundant so
remove it.
Signed-off-by: Colin Ian King <colin.i.king@gmail.com>
Reviewed-by: Leon Romanovsky <leonro@nvidia.com>
Link: https://lore.kernel.org/r/20221115093137.144002-1-colin.i.king@gmail.comSigned-off-by: Paolo Abeni <pabeni@redhat.com>

drivers/net/ethernet/dlink/sundance.c

@@ -1414,7 +1414,6 @@ static void refill_rx (struct net_device *dev)
 {
 	struct netdev_private *np = netdev_priv(dev);
 	int entry;
-	int cnt = 0;
 
 	/* Refill the Rx ring buffers. */
 	for (;(np->cur_rx - np->dirty_rx + RX_RING_SIZE) % RX_RING_SIZE > 0;
@@ -1441,7 +1440,6 @@ static void refill_rx (struct net_device *dev)
 		np->rx_ring[entry].frag.length =
 			cpu_to_le32(np->rx_buf_sz | LastFrag);
 		np->rx_ring[entry].status = 0;
-		cnt++;
 	}
 }
 static void netdev_error(struct net_device *dev, int intr_status)