media: cx231xx: Switch to use kmemdup() helper

Use kmemdup() helper instead of open-coding to
simplify the code.
Signed-off-by: Jinjie Ruan <ruanjinjie@huawei.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>

drivers/media/usb/cx231xx/cx231xx-core.c

@@ -751,10 +751,9 @@ int cx231xx_ep5_bulkout(struct cx231xx *dev, u8 *firmware, u16 size)
 	int ret = -ENOMEM;
 	u32 *buffer;
 
-	buffer = kzalloc(4096, GFP_KERNEL);
+	buffer = kmemdup(firmware, 4096, GFP_KERNEL);
 	if (buffer == NULL)
 		return -ENOMEM;
-	memcpy(&buffer[0], firmware, 4096);
 
 	ret = usb_bulk_msg(dev->udev, usb_sndbulkpipe(dev->udev, 5),
 			buffer, 4096, &actlen, 2000);