anolis: net/smc: double check whether accept queue is empty before schedule_timeout

anolis inclusion
from anolis-v5.10-134
commit 068f0d3b7c070a82c05a74ce6ec7240cad6a92c0
category: performance
bugzilla: https://gitee.com/openeuler/kernel/issues/I782PA
CVE: NA

Reference: https://gitee.com/anolis/hpn-cloud-kernel/commit/068f0d3b7c070a82c05a74ce6ec7240cad6a92c0



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ANBZ: #1742

Double check whether accept queue is empty before schedule_timeout.

Signed-off-by: Guangguan Wang <guangguan.wang@linux.alibaba.com>
Acked-by: Tony Lu <tonylu@linux.alibaba.com>
Link: https://gitee.com/anolis/cloud-kernel/pulls/577
Link: https://gitee.com/anolis/cloud-kernel/pulls/906


Signed-off-by: Litao Jiao <jiaolitao@sangfor.com.cn>