[Bug] rt_sscanf() 在处理 %[ ] 时,出错

### RT-Thread Version

8cf5389  

### Hardware Type/Architectures

STM32F407

### Develop Toolchain

GCC

### Describe the bug

```c
    data = "+MIPURC: \"rtcp\",0,240,HTTP/1.1 200 OK"
    rt_sscanf(data, "+MIPURC:%*[^,],%d,%d", &device_socket, (int *)&bfsz);
```
以上语句, `device_socket` ,`bfsz` 不能正确获取到 0, 240

### Other additional context

_No response_