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在函数rt_spi_sendrecv8中声明了value,后续调用函数rt_spi_send_then_recv(device, &data, 1, &value, 1)。
而在rt_spi_send_then_recv()时如果,在调用rt_mutex_take()后result的值不等于RT_EOK,则value将会在不被赋值的情况下返回,进而导致value在未被赋值的情况下返回,可能导致空指针引用等错误。