nouveau: unreference fences on resource destruction

src/gallium/drivers/nouveau/nouveau_buffer.c

@@ -94,6 +94,9 @@ nouveau_buffer_destroy(struct pipe_screen *pscreen,
    if (res->data && !(res->status & NOUVEAU_BUFFER_STATUS_USER_MEMORY))
       FREE(res->data);
 
+   nouveau_fence_ref(NULL, &res->fence);
+   nouveau_fence_ref(NULL, &res->fence_wr);
+
    FREE(res);
 }
 

src/gallium/drivers/nv50/nv50_miptree.c

@@ -116,6 +116,9 @@ nv50_miptree_destroy(struct pipe_screen *pscreen, struct pipe_resource *pt)
 
    nouveau_bo_ref(NULL, &mt->base.bo);
 
+   nouveau_fence_ref(NULL, &mt->base.fence);
+   nouveau_fence_ref(NULL, &mt->base.fence_wr);
+
    FREE(mt);
 }