[media] davinci: vpbe: fix missing unlock on error in vpbe_initialize()

Add the missing unlock on the error handling path in function
vpbe_initialize().
Signed-off-by: NWei Yongjun <yongjun_wei@trendmicro.com.cn>
Acked-by: NPrabhakar Lad <prabhakar.lad@ti.com>
Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/platform/davinci/vpbe.c

@@ -631,8 +631,10 @@ static int vpbe_initialize(struct device *dev, struct vpbe_device *vpbe_dev)
 
 	err = bus_for_each_dev(&platform_bus_type, NULL, vpbe_dev,
 			       platform_device_get);
-	if (err < 0)
-		return err;
+	if (err < 0) {
+		ret = err;
+		goto fail_dev_unregister;
+	}
 
 	vpbe_dev->venc = venc_sub_dev_init(&vpbe_dev->v4l2_dev,
 					   vpbe_dev->cfg->venc.module_name);