[media] DaVinci-VPBE: Use kmalloc_array() in vpbe_initialize()

* 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 type 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: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

drivers/media/platform/davinci/vpbe.c

@@ -676,9 +676,9 @@ static int vpbe_initialize(struct device *dev, struct vpbe_device *vpbe_dev)
 	 * store venc sd index.
 	 */
 	num_encoders = vpbe_dev->cfg->num_ext_encoders + 1;
-	vpbe_dev->encoders = kmalloc(
-				sizeof(struct v4l2_subdev *)*num_encoders,
-				GFP_KERNEL);
+	vpbe_dev->encoders = kmalloc_array(num_encoders,
+					   sizeof(*vpbe_dev->encoders),
+					   GFP_KERNEL);
 	if (NULL == vpbe_dev->encoders) {
 		v4l2_err(&vpbe_dev->v4l2_dev,
 			"unable to allocate memory for encoders sub devices");