virtio-crypto-pci: Tidy up virtio_crypto_pci_realize()

virtio_crypto_pci_realize() continues after realization of its
"virtio-crypto-device" fails.  Only an object_property_set_link()
follows; looks harmless to me.  Tidy up anyway: return after failure,
just like virtio_rng_pci_realize() does.

Cc: "Gonglei (Arei)" <arei.gonglei@huawei.com>
Cc: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: Gonglei < arei.gonglei@huawei.com>
Message-Id: <20200707160613.848843-7-armbru@redhat.com>

hw/virtio/virtio-crypto-pci.c

@@ -54,7 +54,9 @@ static void virtio_crypto_pci_realize(VirtIOPCIProxy *vpci_dev, Error **errp)
     }
 
     virtio_pci_force_virtio_1(vpci_dev);
-    qdev_realize(vdev, BUS(&vpci_dev->bus), errp);
+    if (!qdev_realize(vdev, BUS(&vpci_dev->bus), errp)) {
+        return;
+    }
     object_property_set_link(OBJECT(vcrypto),
                  OBJECT(vcrypto->vdev.conf.cryptodev), "cryptodev",
                  NULL);