taosdata / TDengine / #2555

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Hotfix/sangshuduo/td 3197 taosdemo coverity scan for master (#7099)

* [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.

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

26996 of 46398 branches covered (58.18%)

Branch coverage included in aggregate %.

49982 of 65759 relevant lines covered (76.01%)

1788341.9 hits per line