Merge branch 'fix-warnings' into 'master'

Fix compiler warnings

See merge request !253
5 jobs for master in 5 minutes and 29 seconds (queued for 5 seconds)
Status Name Job ID Coverage
  Build
passed build-centos7 #17166673

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passed build-centos7-view97 #17166674

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passed build-fedora32 #17166676

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passed build-fedora33 #17166677

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passed build-ubuntu #17166675

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