kxkb: prevent overflow in case of non-existing layout group

Signed-off-by: Roman Savochenko <roman@oscada.org>
Signed-off-by: Michele Calgaro <michele.calgaro@yahoo.it>
(cherry picked from commit d4d334c1af)

kxkb/kxkb.cpp

@@ -274,7 +274,12 @@ void KXKBApp::menuActivated(int id)
 //	}
 }
 
-void KXKBApp::slotGroupChanged(uint group) {
+void KXKBApp::slotGroupChanged(uint group)
+{
+	if (group >= kxkbConfig.m_layouts.count())
+	{
+		group = 0;
+	}
 	m_currentLayout = kxkbConfig.m_layouts[group];
 	m_tray->setCurrentLayout(m_currentLayout);
 }
@@ -341,4 +346,4 @@ extern "C" KDE_EXPORT int kdemain(int argc, char *argv[])
     app.disableSessionManagement();
     app.exec();
     return 0;
-}
+}