taosdata / TDengine / #2584

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Hotfix/sangshuduo/td 3197 taosdemo coverity scan for master (#7510)

* [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.

* fix tcsetattr and getchar return value determination bug.

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

29867 of 53905 branches covered (55.41%)

Branch coverage included in aggregate %.

55814 of 75429 relevant lines covered (74.0%)

2139968.11 hits per line