Trying to fix a zookeeper c-client issue for the first time

[yang yzx_1983 <yz...@outlook.com>]

Hi all,

Hope you're doing well!
I am a zookeeper user and got some problem with the client recently. Searching the zookeeper issue website I found the problem must be the same as an issue that someone reported many years ago but never got fixed (maybe because hard to reproduce).
That is https://issues.apache.org/jira/browse/ZOOKEEPER-2802

I added some information to it including my test code to reproduce the issue and tried to raise an PR to fix it , could anyone take a look and give some suggestion ?

Thank you!

Best regards
Yang zhenxing