staging: octeon-usb: Replace kmalloc with kmalloc_array

Replace kmalloc with specialized function kmalloc_array
when the size is a multiplication of:
	number_of_elements * size_of_element
Signed-off-by: Cristina Moraru <cristina.moraru09@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/octeon-usb/octeon-hcd.c

@@ -3216,7 +3216,7 @@ static int octeon_usb_urb_enqueue(struct usb_hcd *hcd,
 		 * Allocate a structure to use for our private list of
 		 * isochronous packets.
 		 */
-		iso_packet = kmalloc(urb->number_of_packets *
+		iso_packet = kmalloc_array(urb->number_of_packets,
 					   sizeof(struct cvmx_usb_iso_packet),
 					   GFP_ATOMIC);
 		if (iso_packet) {