Debugger: Remove superfluous Q_UNUSED

The variable is actually used.

Change-Id: I4b0510b2bad9d3f3f49609dcac5b314da5769c1e
Reviewed-by: hjk <qthjk@ovi.com>

src/plugins/debugger/debuggerrunner.cpp

@@ -596,8 +596,6 @@ static bool fixupEngineTypes(DebuggerStartParameters &sp, RunConfiguration *rc,
 DebuggerRunControl *DebuggerRunControlFactory::doCreate
     (const DebuggerStartParameters &sp0, RunConfiguration *rc, QString *errorMessage)
 {
-    Q_UNUSED(errorMessage);
-
     TaskHub *th = ProjectExplorerPlugin::instance()->taskHub();
     th->clearTasks(Core::Id(Debugger::Constants::TASK_CATEGORY_DEBUGGER_DEBUGINFO));
     th->clearTasks(Core::Id(Debugger::Constants::TASK_CATEGORY_DEBUGGER_TEST));