-Werror,-Wunused-but-set-variable (Clang 13 trunk)

> unodevtools/source/skeletonmaker/skeletoncommon.cxx(47,13): error: variable 'shortfilename' set but not used [-Werror,-Wunused-but-set-variable]
>     OString shortfilename(filename);
>             ^

Change-Id: I18510a5c2d2ceca4eab3ef93c0a32a1bffafac6e
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/116661
Tested-by: Jenkins
Reviewed-by: Stephan Bergmann <sbergman@redhat.com>

unodevtools/source/skeletonmaker/cppcompskeleton.cxx

@@ -980,7 +980,7 @@ void generateSkeleton(ProgramOptions const & options,
 
     try {
         if (!standardout && options.license) {
-            printLicenseHeader(*pofs, compFileName);
+            printLicenseHeader(*pofs);
         }
 
         generateIncludes(*pofs, interfaces, propertyhelper, serviceobject,
@@ -1138,7 +1138,7 @@ void generateCalcAddin(ProgramOptions const & options,
 
     try {
         if (!standardout && options.license) {
-            printLicenseHeader(*pofs, compFileName);
+            printLicenseHeader(*pofs);
         }
 
         generateIncludes(*pofs, interfaces, propertyhelper, serviceobject,

unodevtools/source/skeletonmaker/javacompskeleton.cxx

@@ -874,7 +874,7 @@ void generateSkeleton(ProgramOptions const & options,
 
     try {
         if (!standardout && options.license) {
-            printLicenseHeader(*pofs, compFileName);
+            printLicenseHeader(*pofs);
         }
 
         generatePackage(*pofs, options.implname);

unodevtools/source/skeletonmaker/skeletoncommon.cxx

@@ -36,18 +36,8 @@ using namespace ::codemaker::cpp;
 
 namespace skeletonmaker {
 
-void printLicenseHeader(std::ostream& o, OString const & filename)
+void printLicenseHeader(std::ostream& o)
 {
-    sal_Int32 index;
-#ifdef SAL_UNX
-    index = filename.lastIndexOf('/');
-#else
-    index = filename.lastIndexOf('\\');
-#endif
-    OString shortfilename(filename);
-    if ( index != -1 )
-        shortfilename = filename.copy(index+1);
-
     o << "/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */\n"
          "/*\n"
          " * This file is part of the LibreOffice project.\n"

unodevtools/source/skeletonmaker/skeletoncommon.hxx

@@ -69,7 +69,7 @@ struct ProgramOptions {
    @param o specifies the output stream
    @param filename specifies the source file name
 */
-void printLicenseHeader(std::ostream& o, OString const & filename);
+void printLicenseHeader(std::ostream& o);
 
 /**
    create dependent on the output path, the implementation name and the