media: vicodec: stateless codecs do not have EOS and SOURCE_CHANGE events

Return an error when attempting to subscribe to those events
for a stateless codec.
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

drivers/media/platform/vicodec/vicodec-core.c

@@ -1293,6 +1293,8 @@ static int vicodec_subscribe_event(struct v4l2_fh *fh,
 			return -EINVAL;
 		/* fall through */
 	case V4L2_EVENT_EOS:
+		if (ctx->is_stateless)
+			return -EINVAL;
 		return v4l2_event_subscribe(fh, sub, 0, NULL);
 	default:
 		return v4l2_ctrl_subscribe_event(fh, sub);