net: mvpp2: Improve another size determination in mvpp2_port_probe()

Replace the specification of a data structure by a pointer dereference
as the parameter for the operator "sizeof" to make the corresponding size
determination a bit safer according to the Linux coding style convention.
Signed-off-by: Markus Elfring <elfring@users.sourceforge.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/marvell/mvpp2.c

@@ -6487,8 +6487,7 @@ static int mvpp2_port_probe(struct platform_device *pdev,
 	int phy_mode;
 	int err, i, cpu;
 
-	dev = alloc_etherdev_mqs(sizeof(struct mvpp2_port), txq_number,
-				 rxq_number);
+	dev = alloc_etherdev_mqs(sizeof(*port), txq_number, rxq_number);
 	if (!dev)
 		return -ENOMEM;