fix errors flagged by clang 8 (!1851) · Merge requests · LHCb / LHCb · GitLab

fixes eg. https://lhcb-nightlies.cern.ch/logs/build/nightly/lhcb-lcg-dev3/859/x86_64-centos7-clang80-opt/LHCb/#show_Kernel_LHCbMath/Kernel_LHCbMath_161, https://lhcb-nightlies.cern.ch/logs/build/nightly/lhcb-lcg-dev4/866/x86_64-centos7-clang80-opt/LHCb/#show_Hlt_HLTScheduler/Hlt_HLTScheduler_215 and https://lhcb-nightlies.cern.ch/logs/build/nightly/lhcb-lcg-dev4/866/x86_64-centos7-clang80-opt/LHCb/#show_Hlt_HLTScheduler/Hlt_HLTScheduler_4

Edited Apr 16, 2019 by Marco Cattaneo