[media] imon: Improve a size determination in two functions

Replace the specification of data structures by pointer dereferences
as the parameter for the operator "sizeof" to make the corresponding size
determination a bit safer according to the Linux coding style convention.

This issue was detected by using the Coccinelle software.
Signed-off-by: Markus Elfring <elfring@users.sourceforge.net>
Signed-off-by: Sean Young <sean@mess.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>

drivers/media/rc/imon.c

@@ -602,8 +602,7 @@ static int send_packet(struct imon_context *ictx)
 		ictx->tx_urb->actual_length = 0;
 	} else {
 		/* fill request into kmalloc'ed space: */
-		control_req = kmalloc(sizeof(struct usb_ctrlrequest),
-				      GFP_KERNEL);
+		control_req = kmalloc(sizeof(*control_req), GFP_KERNEL);
 		if (control_req == NULL)
 			return -ENOMEM;
 
@@ -2310,7 +2309,7 @@ static struct imon_context *imon_init_intf0(struct usb_interface *intf,
 	struct usb_host_interface *iface_desc;
 	int ret = -ENOMEM;
 
-	ictx = kzalloc(sizeof(struct imon_context), GFP_KERNEL);
+	ictx = kzalloc(sizeof(*ictx), GFP_KERNEL);
 	if (!ictx)
 		goto exit;