Merge branch '1-12-logical-op' into 'dbus-1.12'

Backport -Wlogical-op fixes to 1.12.x

See merge request !109
12 jobs for dbus-1.12 in 16 minutes and 50 seconds (queued for 20 seconds)
Status Job ID Name Coverage
  Build
manual #244488
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build:buster
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build:cmake

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build:debug

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build:i686-w64-mingw32-cmake
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build:i686-w64-mingw32-debug

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build:jessie
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build:legacy
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build:production

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build:reduced
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build:x86_64-w64-mingw32

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manual #244486
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build:x86_64-w64-mingw32-cmake-debug
manual #244489
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build:xenial