removed unused variable

semseg/SemSegTools.cpp

@@ -335,7 +335,6 @@ void SemSegTools::collectTrainingExamples (
         for (std::vector<ImageInfo *>::const_iterator jt = it->second.begin();
              jt != it->second.end(); jt++)
         {
-            int classno = it->first;
             ImageInfo & info = *(*jt);
             std::string file = info.img();
             filelist.push_back ( file );