drm/ttm: use designated initializers

Prepare to mark sensitive kernel structures for randomization by making
sure they're using designated initializers. These were identified during
allyesconfig builds of x86, arm, and arm64, with most initializer fixes
extracted from grsecurity.

Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/20161217005929.GA140260@beast

drivers/gpu/drm/virtio/virtgpu_ttm.c

@@ -198,11 +198,11 @@ static void ttm_bo_man_debug(struct ttm_mem_type_manager *man,
 }
 
 static const struct ttm_mem_type_manager_func virtio_gpu_bo_manager_func = {
-	ttm_bo_man_init,
-	ttm_bo_man_takedown,
-	ttm_bo_man_get_node,
-	ttm_bo_man_put_node,
-	ttm_bo_man_debug
+	.init = ttm_bo_man_init,
+	.takedown = ttm_bo_man_takedown,
+	.get_node = ttm_bo_man_get_node,
+	.put_node = ttm_bo_man_put_node,
+	.debug = ttm_bo_man_debug
 };
 
 static int virtio_gpu_init_mem_type(struct ttm_bo_device *bdev, uint32_t type,