CTF: Remove irrelevant comment

Remove comment about lttng not relevant to ctf backend.

Change-Id: I4d4432b1075a27d024db38a3cdd7807a1e94e7ec
Reviewed-by: Tomi Korpipää <tomi.korpipaa@qt.io>
(cherry picked from commit 86398b477bd38d35a411b4439f9da59c10f30eef)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>

src/tools/tracegen/ctf.cpp

@@ -61,7 +61,6 @@ static void writeWrapper(QTextStream &stream,
     const QString includeGuard = QStringLiteral("TP_%1_%2").arg(provider.name).arg(name).toUpper();
 
     /* prevents the redefinion of the inline wrapper functions
-     * once LTTNG recursively includes this header file
      */
     stream << "\n"
            << "#ifndef " << includeGuard << "\n"