media: em28xx-cards: fix em28xx_duplicate_dev()

There is a double sizeof() typo here so we don't duplicate the struct
properly.

Fixes: be7fd3c3 ("media: em28xx: Hauppauge DualHD second tuner functionality")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>

drivers/media/usb/em28xx/em28xx-cards.c

@@ -3515,7 +3515,7 @@ static int em28xx_duplicate_dev(struct em28xx *dev)
 		dev->dev_next = NULL;
 		return -ENOMEM;
 	}
-	memcpy(sec_dev, dev, sizeof(sizeof(*sec_dev)));
+	memcpy(sec_dev, dev, sizeof(*sec_dev));
 	/* Check to see next free device and mark as used */
 	do {
 		nr = find_first_zero_bit(em28xx_devused, EM28XX_MAXBOARDS);