drm/amdgpu: fix vm init error path

Signed-off-by: Chunming Zhou <[e-mail]>
Signed-off-by: Alex Deucher <[e-mail]>

drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c

···
 	r = amd_sched_entity_init(&ring->sched, &vm->entity,
 				  rq, amdgpu_sched_jobs);
 	if (r)
-		return r;
+		goto err;
 
 	vm->page_directory_fence = NULL;
 
···
 
 error_free_sched_entity:
 	amd_sched_entity_fini(&ring->sched, &vm->entity);
+
+err:
+	drm_free_large(vm->page_tables);
 
 	return r;
 }