drm/virtio: Use the drm_driver.dumb_destroy default

virtio_gpu_mode_dumb_destroy() is the same as drm_gem_dumb_destroy()
which is the drm_driver.dumb_destroy default, so no need to set it.

Cc: David Airlie <airlied@linux.ie>
Cc: Gerd Hoffmann <kraxel@redhat.com>
Signed-off-by: Noralf Trønnes <noralf@tronnes.org>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/1502034068-51384-19-git-send-email-noralf@tronnes.org

drivers/gpu/drm/virtio/virtgpu_drv.c

@@ -122,7 +122,6 @@ static struct drm_driver driver = {
 
 	.dumb_create = virtio_gpu_mode_dumb_create,
 	.dumb_map_offset = virtio_gpu_mode_dumb_mmap,
-	.dumb_destroy = virtio_gpu_mode_dumb_destroy,
 
 #if defined(CONFIG_DEBUG_FS)
 	.debugfs_init = virtio_gpu_debugfs_init,

drivers/gpu/drm/virtio/virtgpu_drv.h

@@ -236,9 +236,6 @@ struct virtio_gpu_object *virtio_gpu_alloc_object(struct drm_device *dev,
 int virtio_gpu_mode_dumb_create(struct drm_file *file_priv,
 				struct drm_device *dev,
 				struct drm_mode_create_dumb *args);
-int virtio_gpu_mode_dumb_destroy(struct drm_file *file_priv,
-				 struct drm_device *dev,
-				 uint32_t handle);
 int virtio_gpu_mode_dumb_mmap(struct drm_file *file_priv,
 			      struct drm_device *dev,
 			      uint32_t handle, uint64_t *offset_p);

drivers/gpu/drm/virtio/virtgpu_gem.c

@@ -118,13 +118,6 @@ int virtio_gpu_mode_dumb_create(struct drm_file *file_priv,
 	return ret;
 }
 
-int virtio_gpu_mode_dumb_destroy(struct drm_file *file_priv,
-				 struct drm_device *dev,
-				 uint32_t handle)
-{
-	return drm_gem_handle_delete(file_priv, handle);
-}
-
 int virtio_gpu_mode_dumb_mmap(struct drm_file *file_priv,
 			      struct drm_device *dev,
 			      uint32_t handle, uint64_t *offset_p)