media: meson/ge2d: set ret to -ENOMEM

Fix this smatch warning:

drivers/media/platform/meson/ge2d/ge2d.c:991 ge2d_probe() warn: missing error code 'ret'

when video_device_alloc() returns NULL.
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Cc: Neil Armstrong <narmstrong@baylibre.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

drivers/media/platform/meson/ge2d/ge2d.c

@@ -988,6 +988,7 @@ static int ge2d_probe(struct platform_device *pdev)
 	vfd = video_device_alloc();
 	if (!vfd) {
 		v4l2_err(&ge2d->v4l2_dev, "Failed to allocate video device\n");
+		ret = -ENOMEM;
 		goto unreg_v4l2_dev;
 	}