Fixed missing return statement in CSVFile method.

radixio/csvfile.cc

@@ -65,6 +65,7 @@ bool radix::CSVFile::data(std::vector<std::vector<std::string>> &data) const
         data.push_back(row(line));
     }
     in.close();
+    return true;
 }
 
 radix::CSVFile::CSVFile(const std::string &file)