[media] EM28xx - Fix memory leak on disconnect or error

Release the dev->alt_max_pkt_size buffer in all cases.
Signed-off-by: NChris Rankin <rankincj@yahoo.com>
Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>

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

@@ -3201,6 +3201,7 @@ static int em28xx_usb_probe(struct usb_interface *interface,
 	retval = em28xx_init_dev(&dev, udev, interface, nr);
 	if (retval) {
 		mutex_unlock(&dev->lock);
+		kfree(dev->alt_max_pkt_size);
 		kfree(dev);
 		goto err;
 	}

drivers/media/video/em28xx/em28xx-video.c

@@ -2200,6 +2200,7 @@ static int em28xx_v4l2_close(struct file *filp)
 		   free the remaining resources */
 		if (dev->state & DEV_DISCONNECTED) {
 			em28xx_release_resources(dev);
+			kfree(dev->alt_max_pkt_size);
 			kfree(dev);
 			return 0;
 		}