ATM-ENI: Use kmalloc_array() in eni_start()

* A multiplication for the size determination of a memory allocation
  indicated that an array data structure should be processed.
  Thus use the corresponding function "kmalloc_array".

  This issue was detected by using the Coccinelle software.

* Replace the specification of a data structure by a pointer dereference
  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/eni.c

@@ -1845,8 +1845,9 @@ static int eni_start(struct atm_dev *dev)
 	/* initialize memory management */
 	buffer_mem = eni_dev->mem - (buf - eni_dev->ram);
 	eni_dev->free_list_size = buffer_mem/MID_MIN_BUF_SIZE/2;
-	eni_dev->free_list = kmalloc(
-	    sizeof(struct eni_free)*(eni_dev->free_list_size+1),GFP_KERNEL);
+	eni_dev->free_list = kmalloc_array(eni_dev->free_list_size + 1,
+					   sizeof(*eni_dev->free_list),
+					   GFP_KERNEL);
 	if (!eni_dev->free_list) {
 		printk(KERN_ERR DEV_LABEL "(itf %d): couldn't get free page\n",
 		    dev->number);