anv/allocator: Assert that we have a valid gem handle in bo_pool_alloc

src/intel/vulkan/anv_allocator.c

@@ -831,6 +831,7 @@ anv_bo_pool_alloc(struct anv_bo_pool *pool, struct anv_bo *bo, uint32_t size)
    if (anv_ptr_free_list_pop(&pool->free_list[bucket], &next_free_void)) {
       struct bo_pool_bo_link *next_free = next_free_void;
       *bo = VG_NOACCESS_READ(&next_free->bo);
+      assert(bo->gem_handle);
       assert(bo->map == next_free);
       assert(size <= bo->size);