taosdata / TDengine / #2577

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Hotfix/sangshuduo/td 3197 taosdemo coverity scan for master (#7375)

* [TD-3197]<fix>: taosdemo and taosdump coverity scan issues.

* exit if read sample file failed.

* fix converity scan issue.

* fix coverity scan issue.

* fix coverity scan memory leak.

* fix resource leak reported by coverity scan.

* fix taosdemo coverity scan issue.

Co-authored-by: Shuduo Sang <sdsang@taosdata.com>

30820 of 53648 branches covered (57.45%)

Branch coverage included in aggregate %.

56942 of 75158 relevant lines covered (75.76%)

2693871.95 hits per line