[2637] Minor: corrected error message in the option definition.

src/lib/dhcp/option_definition.cc

@@ -188,8 +188,8 @@ OptionDefinition::optionFactory(Option::Universe u, uint16_t type,
         const RecordFieldsCollection& records = getRecordFields();
         if (records.size() > values.size()) {
             isc_throw(InvalidOptionValue, "number of data fields for the option"
-                      << " type " << type_ << " is greater than number of values"
-                      << " provided.");
+                      << " type '" <<  getCode() << "' is greater than number"
+                      << " of values provided.");
         }
         for (size_t i = 0; i < records.size(); ++i) {
             writeToBuffer(util::str::trim(values[i]),