ATM-ZeitNet: Improve a size determination in zatm_open()

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/atm/zatm.c

@@ -1399,7 +1399,7 @@ static int zatm_open(struct atm_vcc *vcc)
 	DPRINTK(DEV_LABEL "(itf %d): open %d.%d\n",vcc->dev->number,vcc->vpi,
 	    vcc->vci);
 	if (!test_bit(ATM_VF_PARTIAL,&vcc->flags)) {
-		zatm_vcc = kmalloc(sizeof(struct zatm_vcc),GFP_KERNEL);
+		zatm_vcc = kmalloc(sizeof(*zatm_vcc), GFP_KERNEL);
 		if (!zatm_vcc) {
 			clear_bit(ATM_VF_ADDR,&vcc->flags);
 			return -ENOMEM;