clean up a batch of coverity issues #1783
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https://scan5.scan.coverity.com/#/project-view/60762/10222?selectedIssue=1677834
https://scan5.scan.coverity.com/#/project-view/60762/10222?selectedIssue=1677832 https://scan5.scan.coverity.com/#/project-view/60762/10222?selectedIssue=1677831
https://scan5.scan.coverity.com/#/project-view/60762/10222?selectedIssue=1677830
https://scan5.scan.coverity.com/#/project-view/60762/10222?selectedIssue=1677829
https://scan5.scan.coverity.com/#/project-view/60762/10222?selectedIssue=1677828
https://scan5.scan.coverity.com/#/project-view/60762/10222?selectedIssue=1677827
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