altera: Remove casts of pointer to same type

Casting a pointer to a pointer of the same type is pointless,
so remove these unnecessary casts.

Done via coccinelle script:

$ cat typecast_2.cocci
@@
type T;
T *foo;
@@

-	(T *)foo
+	foo
Signed-off-by: NJoe Perches <joe@perches.com>
Acked-by: NVince Bridgers <vbridgers2013@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/ethernet/altera/altera_tse_main.c

@@ -933,7 +933,7 @@ static int tse_change_mtu(struct net_device *dev, int new_mtu)
 static void altera_tse_set_mcfilter(struct net_device *dev)
 {
 	struct altera_tse_private *priv = netdev_priv(dev);
-	struct altera_tse_mac *mac = (struct altera_tse_mac *)priv->mac_dev;
+	struct altera_tse_mac *mac = priv->mac_dev;
 	int i;
 	struct netdev_hw_addr *ha;
 
@@ -963,7 +963,7 @@ static void altera_tse_set_mcfilter(struct net_device *dev)
 static void altera_tse_set_mcfilterall(struct net_device *dev)
 {
 	struct altera_tse_private *priv = netdev_priv(dev);
-	struct altera_tse_mac *mac = (struct altera_tse_mac *)priv->mac_dev;
+	struct altera_tse_mac *mac = priv->mac_dev;
 	int i;
 
 	/* set the hash filter */