virtio-ccw: Fix definition of VIRTIO_CCW_BUS_GET_CLASS

The macro was incorrectly defined using OBJECT_CHECK.

Acked-by: Cornelia Huck <cohuck@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
Tested-By: Roman Bolshakov <r.bolshakov@yadro.com>
Message-Id: <20200825192110.3528606-13-ehabkost@redhat.com>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>

hw/s390x/virtio-ccw.h

@@ -65,9 +65,9 @@ typedef struct VirtioBusClass VirtioCcwBusClass;
 
 #define TYPE_VIRTIO_CCW_BUS "virtio-ccw-bus"
 #define VIRTIO_CCW_BUS(obj) \
-     OBJECT_CHECK(VirtioCcwBus, (obj), TYPE_VIRTIO_CCW_BUS)
+     OBJECT_CHECK(VirtioCcwBusState, (obj), TYPE_VIRTIO_CCW_BUS)
 #define VIRTIO_CCW_BUS_GET_CLASS(obj) \
-    OBJECT_CHECK(VirtioCcwBusState, (obj), TYPE_VIRTIO_CCW_BUS)
+    OBJECT_GET_CLASS(VirtioCcwBusClass, (obj), TYPE_VIRTIO_CCW_BUS)
 #define VIRTIO_CCW_BUS_CLASS(klass) \
     OBJECT_CLASS_CHECK(VirtioCcwBusClass, klass, TYPE_VIRTIO_CCW_BUS)