anolis: cachefiles: fix potential NULL in error path

ANBZ: #3213

When entering the error path, the request may not have been allocated or
req->object may not have been initialized.

Fixes: 5d1970f ("anolis: cachefiles: resend an open request if the read request's object is closed")
Reported-by: Jia Zhu <[email protected]>
Signed-off-by: Jingbo Xu <[email protected]>
Reviewed-by: Joseph Qi <[email protected]>
Link: https://gitee.com/anolis/cloud-kernel/pulls/1022

Author: lostjeffle

fs/cachefiles/ondemand.c

@@ -468,7 +468,7 @@ static int cachefiles_ondemand_send_req(struct cachefiles_object *object,
 	 * cachefiles_ondemand_fd_release() will set object to close.
 	 */
 	if (opcode == CACHEFILES_OP_OPEN)
-		cachefiles_ondemand_set_object_close(req->object);
+		cachefiles_ondemand_set_object_close(object);
 	kfree(req);
 	return ret;
 }