Build failure in qqmldebugserver: cleanup() defined but not used

Building Qt from git configured with "-no-qml-debug" gives:

/build/qt5/qtdeclarative/src/qml/debugger/qqmldebugserver.cpp:342:13: error: ‘void cleanup()’ defined but not used [-Werror=unused-function]
 static void cleanup()
             ^
cc1plus: all warnings being treated as errors

cleanup() seems to be used in line 403 of that file in a section guarded by #ifndef QT_QML_NO_DEBUGGER.
Guarding the definition of cleanup() in the same way solve this build issue.