Memory leak in QMessagePattern::setPattern

If we use qSetMessagePattern with following pattern we get the following stacktrace from memory sanitizer.

%{time yyyy.MM.dd hh:mm:ss.zzz} %{if-debug}D%{endif}%{if-warning}W%{endif}%{if-critical}C%{endif}%{if-fatal}F%{endif} %{function}(%{file}:%{line}) %{message}

Direct leak of 3 byte(s) in 1 object(s) allocated from:
#0 in operator new[](unsigned long) ([...]/binary+0x4380eb)
#1 in QMessagePattern::setPattern(QString const&) [...]/qtbase/src/corelib/global/qlogging.cpp:998
#2 in QMessagePattern::QMessagePattern() [...]/qtbase/src/corelib/global/qlogging.cpp:863
#3 in (anonymous namespace)::Q_QGS_qMessagePattern::innerFunction()::Holder::Holder() [...]/qtbase/src/corelib/global/qlogging.cpp:1078
#4 in (anonymous namespace)::Q_QGS_qMessagePattern::innerFunction() [...]/qtbase/src/corelib/global/qlogging.cpp:1078
#5 in QGlobalStatic<QMessagePattern, (anonymous namespace)::Q_QGS_qMessagePattern::innerFunction(), (anonymous namespace)::Q_QGS_qMessagePattern::guard>::operator()() /home/andre/hg/libs/qt54/dist/include/QtCore/qglobalstatic.h:129
#6 in qSetMessagePattern(QString const&) [...]/qtbase/src/corelib/global/qlogging.cpp:1613
#7 in LogHandler::LogHandler() [...]/src/global/LogHandler.cpp:119:2
#8 in __cxx_global_var_init [...]/src/global/LogHandler.cpp:73:24
#9 in GLOBAL_sub_I_LogHandler.stdout.e6430.2629.dTxvqP.ii [...]/dist/include/QtCore/qbytearray.h
#10 in call_init.part.0 (/lib64/ld-linux-x86-64.so.2+0xf249)