drivers/net/xen-netback/netback.c:886:7: warning: variable ‘pending_idx’ set but not used. In the following kernel version: name: linux-next url: http://kernel.source.codeaurora.cn/pub/scm/linux/kernel/git/next/linux-next.git branch: next-20221208 commit: f925116b24c0c42dc6d5ab5111c55fd7f74e8dc7