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BUG REPORT

1. example目录中 Producer.c 里面用到DestroyProducer函数会导致程序coredump
2. DestroyProducer函数在src/extern/CProducer.cpp中
   delete reinterpret_cast<DefaultMQProducer*>(pProducer);
   可能存在问题，应该修改为
   delete reinterpret_cast<DefaultProducer*>(pProducer);
   麻烦评估是否合理。
   ps：修改后自行编译后该函数没有coredump了。