media: stkwebcam: fix memory leak in stk_camera_probe

My local syzbot instance hit memory leak in usb_set_configuration().
The problem was in unputted usb interface. In case of errors after
usb_get_intf() the reference should be putted to correclty free memory
allocated for this interface.

Fixes: ec16dae5 ("V4L/DVB (7019): V4L: add support for Syntek DC1125 webcams")
Cc: stable@vger.kernel.org
Signed-off-by: Pavel Skripkin <paskripkin@gmail.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

drivers/media/usb/stkwebcam/stk-webcam.c

@@ -1346,7 +1346,7 @@ static int stk_camera_probe(struct usb_interface *interface,
 	if (!dev->isoc_ep) {
 		pr_err("Could not find isoc-in endpoint\n");
 		err = -ENODEV;
-		goto error;
+		goto error_put;
 	}
 	dev->vsettings.palette = V4L2_PIX_FMT_RGB565;
 	dev->vsettings.mode = MODE_VGA;
@@ -1359,10 +1359,12 @@ static int stk_camera_probe(struct usb_interface *interface,
 
 	err = stk_register_video_device(dev);
 	if (err)
-		goto error;
+		goto error_put;
 
 	return 0;
 
+error_put:
+	usb_put_intf(interface);
 error:
 	v4l2_ctrl_handler_free(hdl);
 	v4l2_device_unregister(&dev->v4l2_dev);