vfio: platform: simplify device removal

vfio_platform_remove_common() cannot return non-NULL in
vfio_amba_remove() as the latter is only called if vfio_amba_probe()
returned success.
Diagnosed-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Eric Auger <eric.auger@redhat.com>
Link: https://lore.kernel.org/r/20210126165835.687514-4-u.kleine-koenig@pengutronix.deSigned-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>

drivers/vfio/platform/vfio_amba.c

@@ -73,16 +73,12 @@ static int vfio_amba_probe(struct amba_device *adev, const struct amba_id *id)
 
 static int vfio_amba_remove(struct amba_device *adev)
 {
-	struct vfio_platform_device *vdev;
-
-	vdev = vfio_platform_remove_common(&adev->dev);
-	if (vdev) {
-		kfree(vdev->name);
-		kfree(vdev);
-		return 0;
-	}
+	struct vfio_platform_device *vdev =
+		vfio_platform_remove_common(&adev->dev);
 
-	return -EINVAL;
+	kfree(vdev->name);
+	kfree(vdev);
+	return 0;
 }
 
 static const struct amba_id pl330_ids[] = {