drm/virtio: move to_virtio_fence inside virtgpu_fence

That's the only file that uses it.
Signed-off-by: Gurchetan Singh <gurchetansingh@chromium.org>
Link: http://patchwork.freedesktop.org/patch/msgid/20191219005733.18960-5-gurchetansingh@chromium.orgSigned-off-by: Gerd Hoffmann <kraxel@redhat.com>

drivers/gpu/drm/virtio/virtgpu_drv.h

@@ -103,8 +103,6 @@ struct virtio_gpu_fence {
 	struct virtio_gpu_fence_driver *drv;
 	struct list_head node;
 };
-#define to_virtio_fence(x) \
-	container_of(x, struct virtio_gpu_fence, f)
 
 struct virtio_gpu_vbuffer {
 	char *buf;

drivers/gpu/drm/virtio/virtgpu_fence.c

@@ -27,6 +27,9 @@
 
 #include "virtgpu_drv.h"
 
+#define to_virtio_fence(x) \
+	container_of(x, struct virtio_gpu_fence, f)
+
 static const char *virtio_get_driver_name(struct dma_fence *f)
 {
 	return "virtio_gpu";