* [TD-5702]<fix>: taosdemo remove memory operation.

* [TD-5702]<fix>: taosdemo remove memory operation.

* add remainderBufLen to check row data generation.

* row data generation with remainder buffer length checking.

* git checkout --patch hotfix/sangshuduo/TD-5702-taosdemo-remove-memop taosdemo.c
Co-authored-by: NShuduo Sang <sdsang@taosdata.com>