fix：fixed crash issues when the illegal topic is received #101
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在大量压测中，设备建立mqtt连接之后，偶现收到下行异常主题（出现异常主题原因我怀疑时，socket读取到异常消息所致），概率出现crash问题。
原因：
line56中，if条件语句为真，即异常exit，返回值理应为error（0）。但实际返回值却可能会被line53行修改为了1。
此时调用MQTTDeserialize_publish接口的逻辑，可能会因为payload为空，及payloadlen为0，产生非法地址访问。