ATM-nicstar: Improve another size determination in ns_init_card()

Replace the specification of a data structure by a reference for a field
in a local variable 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/atm/nicstar.c

@@ -611,7 +611,7 @@ static int ns_init_card(int i, struct pci_dev *pcidev)
 	for (j = 0; j < card->rct_size; j++)
 		ns_write_sram(card, j * 4, u32d, 4);
 
-	memset(card->vcmap, 0, NS_MAX_RCTSIZE * sizeof(vc_map));
+	memset(card->vcmap, 0, sizeof(card->vcmap));
 
 	for (j = 0; j < NS_FRSCD_NUM; j++)
 		card->scd2vc[j] = NULL;