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由 sangshuduo 提交于
* [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: NShuduo Sang <sdsang@taosdata.com>
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