media: davinci/vpbe.c: ret contains the return code, not err

Fixes this smatch warning:

drivers/media/platform/davinci/vpbe.c:632 vpbe_initialize() warn: missing error code 'ret'

The function returns 'ret', but instead 'err' was set to -ENOMEM.
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Cc: "Lad, Prabhakar" <prabhakar.csengg@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

drivers/media/platform/davinci/vpbe.c

@@ -628,7 +628,7 @@ static int vpbe_initialize(struct device *dev, struct vpbe_device *vpbe_dev)
 		if (err) {
 			v4l2_err(&vpbe_dev->v4l2_dev,
 				 "unable to initialize the OSD device");
-			err = -ENOMEM;
+			ret = -ENOMEM;
 			goto fail_dev_unregister;
 		}
 	}