[media] RedRat3: Use kcalloc() in two functions

* Multiplications for the size determination of memory allocations
  indicated that array data structures should be processed.
  Thus use the corresponding function "kcalloc".

  This issue was detected by using the Coccinelle software.

* Replace the specification of data types by pointer dereferences
  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: Mauro Carvalho Chehab <mchehab@s-opensource.com>

drivers/media/rc/redrat3.c

@@ -588,7 +588,7 @@ static void redrat3_get_firmware_rev(struct redrat3_dev *rr3)
 	int rc = 0;
 	char *buffer;
 
-	buffer = kzalloc(sizeof(char) * (RR3_FW_VERSION_LEN + 1), GFP_KERNEL);
+	buffer = kcalloc(RR3_FW_VERSION_LEN + 1, sizeof(*buffer), GFP_KERNEL);
 	if (!buffer) {
 		dev_err(rr3->dev, "Memory allocation failure\n");
 		return;
@@ -780,7 +780,9 @@ static int redrat3_transmit_ir(struct rc_dev *rcdev, unsigned *txbuf,
 	/* rr3 will disable rc detector on transmit */
 	rr3->transmitting = true;
 
-	sample_lens = kzalloc(sizeof(int) * RR3_DRIVER_MAXLENS, GFP_KERNEL);
+	sample_lens = kcalloc(RR3_DRIVER_MAXLENS,
+			      sizeof(*sample_lens),
+			      GFP_KERNEL);
 	if (!sample_lens) {
 		ret = -ENOMEM;
 		goto out;