drm/i915/selftests: Free mock_i915->drm.mode_config

Even for the mock i915 device, we need to initialise the
drm.mode_config, as we may ultimately query whether there are any KMS
users deep in the bowels of some paths (e.g. eviction). As we initialise
drm.mode_config we must cleanup after ourselves!

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Matthew Auld <matthew.auld@intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Reviewed-by: Matthew Auld <matthew.auld@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171209210835.32609-1-chris@chris-wilson.co.uk

drivers/gpu/drm/i915/selftests/mock_gem_device.c

@@ -85,6 +85,8 @@ static void mock_device_release(struct drm_device *dev)
 
 	i915_gemfs_fini(i915);
 
+	drm_mode_config_cleanup(&i915->drm);
+
 	drm_dev_fini(&i915->drm);
 	put_device(&i915->drm.pdev->dev);
 }
@@ -187,7 +189,7 @@ struct drm_i915_private *mock_gem_device(void)
 
 	i915->wq = alloc_ordered_workqueue("mock", 0);
 	if (!i915->wq)
-		goto put_device;
+		goto err_drv;
 
 	mock_init_contexts(i915);
 
@@ -266,6 +268,9 @@ err_objects:
 	kmem_cache_destroy(i915->objects);
 err_wq:
 	destroy_workqueue(i915->wq);
+err_drv:
+	drm_mode_config_cleanup(&i915->drm);
+	drm_dev_fini(&i915->drm);
 put_device:
 	put_device(&pdev->dev);
 err: