cmCPackDebGenerator: Remove unused local variable

Source/CPack/cmCPackDebGenerator.cxx

@@ -167,7 +167,6 @@ void DebGenerator::generateControlFile() const
 
   unsigned long totalSize = 0;
   {
-    std::string dirName = cmStrCat(this->TemporaryDir, '/');
     for (std::string const& file : this->PackageFiles) {
       totalSize += cmSystemTools::FileLength(file);
     }