V4L/DVB (5073): Fix OOPS on some waitqueue conditions

If for some reason vivi_thread() fails, vivi will suffer an OOPS at
thread stop code, since waitqueue wouldn't be properly initializated.

Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
diff --git a/drivers/media/video/vivi.c b/drivers/media/video/vivi.c
index cfb6b1f..119cfd5 100644
--- a/drivers/media/video/vivi.c
+++ b/drivers/media/video/vivi.c
@@ -538,7 +538,6 @@
 	dma_q->ini_jiffies=jiffies;
 
 	dprintk(1,"%s\n",__FUNCTION__);
-	init_waitqueue_head(&dma_q->wq);
 
 	dma_q->kthread = kthread_run(vivi_thread, dma_q, "vivi");
 
@@ -1352,6 +1351,7 @@
 	/* init video dma queues */
 	INIT_LIST_HEAD(&dev->vidq.active);
 	INIT_LIST_HEAD(&dev->vidq.queued);
+	init_waitqueue_head(&dev->vidq.wq);
 
 	/* initialize locks */
 	init_MUTEX(&dev->lock);