Fix missing return

This resolves Bug 2438

Signed-off-by: François Andriot <francois.andriot@free.fr>
(cherry picked from commit b97628ae1a)

systemsettings/tdecmodulemenu.cpp

@@ -185,4 +185,5 @@ TQString TDECModuleMenu::deriveCaptionFromPath( const TQString &menuPath )
 			return result;
 		}
 	}
+	return result;
 }