V4L/DVB (6602): V4L: Convert videobuf drivers to videobuf_stop

Drivers were using cookie cutter code for stopping the read/stream.  Use the
new videobuf_stop function which is lock safe.

Signed-off-by: Brandon Philips <bphilips@suse.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
diff --git a/drivers/media/video/vivi.c b/drivers/media/video/vivi.c
index ee73dc7..9b54ff9 100644
--- a/drivers/media/video/vivi.c
+++ b/drivers/media/video/vivi.c
@@ -1076,6 +1076,7 @@
 	int minor = iminor(inode);
 
 	vivi_stop_thread(vidq);
+	videobuf_stop(&fh->vb_vidq);
 	videobuf_mmap_free(&fh->vb_vidq);
 
 	kfree (fh);