[frank-w-bpi-r2-4.14:6.12-rsslro 71/71] drivers/net/ethernet/mediatek/mtk_eth_dbg.c:66:13: warning: variable 'ret' set but not used

[kernel test robot <lkp@intel.com>]

tree:   https://github.com/frank-w/BPI-R2-4.14 6.12-rsslro
head:   ee43e37385973e1a8f997188dff7a58321371b92
commit: ee43e37385973e1a8f997188dff7a58321371b92 [71/71] debug: try to add mtk debugfs for RSS
config: s390-allyesconfig (https://download.01.org/0day-ci/archive/20241101/202411010018.QmnmbvuM-lkp@intel.com/config)
compiler: s390-linux-gcc (GCC) 14.1.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20241101/202411010018.QmnmbvuM-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202411010018.QmnmbvuM-lkp@intel.com/

All warnings (new ones prefixed by >>):

   drivers/net/ethernet/mediatek/mtk_eth_dbg.c: In function 'rss_ctrl_write':
>> drivers/net/ethernet/mediatek/mtk_eth_dbg.c:66:13: warning: variable 'ret' set but not used [-Wunused-but-set-variable]
      66 |         int ret;
         |             ^~~


vim +/ret +66 drivers/net/ethernet/mediatek/mtk_eth_dbg.c

    56	
    57	static ssize_t rss_ctrl_write(struct file *file, const char __user *buffer,
    58			       size_t count, loff_t *data)
    59	{
    60		char buf[32];
    61		char *p_buf;
    62		char *p_token = NULL;
    63		char *p_delimiter = " \t";
    64		long num = 4;
    65		u32 len = count;
  > 66		int ret;
    67		if (len >= sizeof(buf)) {
    68			pr_info("Input handling fail!\n");
    69			return -1;
    70		}
    71		if (copy_from_user(buf, buffer, len))
    72			return -EFAULT;
    73		buf[len] = '\0';
    74		p_buf = buf;
    75		p_token = strsep(&p_buf, p_delimiter);
    76		if (!p_token)
    77			num = 4;
    78		else
    79			ret = kstrtol(p_token, 10, &num);
    80		if (!mtk_rss_set_indr_tbl(g_eth, num))
    81			cur_rss_num = num;
    82		return count;
    83	}
    84	

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