Fix memory leak when mqtt_yield_thread exits problem and delete unuse… #59
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1、关于static void mqtt_yield_thread(void arg)函数内存泄漏问题
当内部线程退出时并没有真正释放里面的内存，这是因为platform_thread_init里面的malloc并没有被释放掉，因此当调用mqtt_release接口时会有1个内存泄漏。
2、int mqtt_list_subscribe_topic(mqtt_client_t c)
该函数中有一个未被使用的变量i在编译时会产生警告，已去除。