only append to cpu string if not initialized

RWKV / rwkv.cpp

INT4/INT5/INT8 and FP16 inference on CPU for RWKV language model

MIT License

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Closed marty1885 closed 1 year ago

marty1885 commented 1 year ago

Hi, This PR fixes when rwkv_get_system_info_string() gets called multiples times. The returned string becomes longer and longer.