V4L/DVB (10912): vivi: fix compile warning.

Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
diff --git a/drivers/media/video/vivi.c b/drivers/media/video/vivi.c
index 980620f..fbfefae 100644
--- a/drivers/media/video/vivi.c
+++ b/drivers/media/video/vivi.c
@@ -1406,7 +1406,7 @@
  */
 static int __init vivi_init(void)
 {
-	int ret, i;
+	int ret = 0, i;
 
 	if (n_devs <= 0)
 		n_devs = 1;