Re: [PATCH v6 2/2] iio: adc: ad7173: add AD7173 driver

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

Hi mitrutzceclan,

kernel test robot noticed the following build warnings:

[auto build test WARNING on jic23-iio/togreg]
[also build test WARNING on linus/master v6.7-rc2 next-20231124]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/mitrutzceclan/iio-adc-ad7173-add-AD7173-driver/20231123-233012
base:   https://git.kernel.org/pub/scm/linux/kernel/git/jic23/iio.git togreg
patch link:    https://lore.kernel.org/r/20231123152331.5751-2-user%40HYB-hhAwRlzzMZb
patch subject: [PATCH v6 2/2] iio: adc: ad7173: add AD7173 driver
config: x86_64-allyesconfig (https://download.01.org/0day-ci/archive/20231124/202311241251.qDeS0ZtB-lkp@intel.com/config)
compiler: clang version 16.0.4 (https://github.com/llvm/llvm-project.git ae42196bc493ffe877a7e3dff8be32035dea4d07)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20231124/202311241251.qDeS0ZtB-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/202311241251.qDeS0ZtB-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> drivers/iio/adc/ad7173.c:329:22: warning: variable 'offset' set but not used [-Wunused-but-set-variable]
           ptrdiff_t cmp_size, offset;
                               ^
   1 warning generated.


vim +/offset +329 drivers/iio/adc/ad7173.c

   324	
   325	static struct ad7173_channel_config *
   326	ad7173_find_live_config(struct ad7173_state *st, struct ad7173_channel_config *cfg)
   327	{
   328		struct ad7173_channel_config *cfg_aux;
 > 329		ptrdiff_t cmp_size, offset;
   330		int i;
   331	
   332		offset = offsetofend(struct ad7173_channel_config, live);
   333		cmp_size = sizeof_field(struct ad7173_channel_config, config_props);
   334	
   335		for (i = 0; i < st->num_channels; i++) {
   336			cfg_aux = &st->channels[i].cfg;
   337	
   338			if (cfg_aux->live &&
   339			    !memcmp(&cfg->bipolar, &cfg_aux->bipolar, cmp_size))
   340				return cfg_aux;
   341		}
   342		return NULL;
   343	}
   344	

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