Fixed a potential memory leak

src/aion/common/NetMessage.cc

@@ -162,6 +162,7 @@ void NetMessage::verifyTypeInfo(const std::string &type, const std::string &fiel
                 std::cerr << "Trying to read a std::string with size " << size << "which is quite too long" << std::endl;
                 assert(0);
             }
+            delete[] stype;
             mGood = false;
             return;
         }