V4L/DVB: hdpvr: Fixes probing function

In the hdpvr_probe () function, when an error occurs while probing the device,
the workqueue created by the create_single_thread () call is not properly
destroyed.
Signed-off-by: Perceval Anichini <perceval@trilogic.fr>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/video/hdpvr/hdpvr-core.c

@@ -286,6 +286,8 @@ static int hdpvr_probe(struct usb_interface *interface,
 		goto error;
 	}
 
+	dev->workqueue = 0;
+
 	/* register v4l2_device early so it can be used for printks */
 	if (v4l2_device_register(&interface->dev, &dev->v4l2_dev)) {
 		err("v4l2_device_register failed");
@@ -380,6 +382,9 @@ static int hdpvr_probe(struct usb_interface *interface,
 
 error:
 	if (dev) {
+		/* Destroy single thread */
+		if (dev->workqueue)
+			destroy_workqueue(dev->workqueue);
 		/* this frees allocated memory */
 		hdpvr_delete(dev);
 	}