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 <[e-mail]>
Reviewed-by: Leon Romanovsky <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Paolo Abeni <[e-mail]>

drivers/net/ethernet/dlink/sundance.c

···
 {
 	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;
···
 		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)