[freescale-fslc:pr/642 100/30000] sound/soc/fsl/fsl_spdif.c:765:37: sparse: sparse: Using plain integer as NULL pointer

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

tree:   https://github.com/Freescale/linux-fslc pr/642
head:   c8b7cf62c7fea8456dec789d550b8006d73b8f04
commit: 960f3f4848db6e2b0b83407e053dd0fed920e60a [100/30000] MLK-19154-3: ASoC: fsl_spdif: Add support for PLL switch at runtime.
config: i386-randconfig-062-20231021 (https://download.01.org/0day-ci/archive/20231024/202310240829.0Xb56XJU-lkp@intel.com/config)
compiler: gcc-12 (Debian 12.2.0-14) 12.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20231024/202310240829.0Xb56XJU-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/202310240829.0Xb56XJU-lkp@intel.com/

sparse warnings: (new ones prefixed by >>)
>> sound/soc/fsl/fsl_spdif.c:765:37: sparse: sparse: Using plain integer as NULL pointer
   sound/soc/fsl/fsl_spdif.c:765:48: sparse: sparse: Using plain integer as NULL pointer

vim +765 sound/soc/fsl/fsl_spdif.c

   758	
   759	static int fsl_spdif_set_dai_sysclk(struct snd_soc_dai *cpu_dai,
   760			int clk_id, unsigned int freq, int dir)
   761	{
   762		struct fsl_spdif_priv *data = snd_soc_dai_get_drvdata(cpu_dai);
   763		struct platform_device *pdev = data->pdev;
   764		struct device *dev = &pdev->dev;
 > 765		struct clk *clk, *p, *pll = 0, *npll = 0;
   766		u64 ratio = freq;
   767		int ret, i;
   768	
   769		if (dir != SND_SOC_CLOCK_OUT || freq == 0 || clk_id != STC_TXCLK_SPDIF_ROOT)
   770			return 0;
   771	
   772		if (data->pll8k_clk == NULL || data->pll11k_clk == NULL)
   773			return 0;
   774	
   775		clk = data->txclk[clk_id];
   776		if (IS_ERR_OR_NULL(clk)) {
   777			dev_err(dev, "no rxtx%d clock in devicetree\n", clk_id);
   778			return PTR_ERR(clk);
   779		}
   780	
   781		p = clk;
   782		while (p && data->pll8k_clk && data->pll11k_clk) {
   783			struct clk *pp = clk_get_parent(p);
   784	
   785			if (clk_is_match(pp, data->pll8k_clk) ||
   786			    clk_is_match(pp, data->pll11k_clk)) {
   787				pll = pp;
   788				break;
   789			}
   790			p = pp;
   791		}
   792	
   793		if (pll) {
   794			npll = (do_div(ratio, 8000) ? data->pll11k_clk : data->pll8k_clk);
   795			if (!clk_is_match(pll, npll)) {
   796				if (!data->streams) {
   797					ret = clk_set_parent(p, npll);
   798					if (ret < 0)
   799						dev_warn(cpu_dai->dev,
   800							"failed to set parent %s: %d\n",
   801							__clk_get_name(npll), ret);
   802				} else {
   803					dev_err(cpu_dai->dev,
   804						"PLL %s is in use by a running stream.\n",
   805						__clk_get_name(pll));
   806					return -EINVAL;
   807				}
   808			}
   809		}
   810	
   811		ret = clk_set_rate(clk, freq);
   812		if (ret < 0) {
   813			dev_err(cpu_dai->dev, "failed to set clock rate (%u): %d\n",
   814				freq, ret);
   815			return ret;
   816		}
   817	
   818		for (i = 0; i < SPDIF_TXRATE_MAX; i++) {
   819			ret = fsl_spdif_probe_txclk(data, i);
   820			if (ret)
   821				return ret;
   822		}
   823	
   824		return 0;
   825	}
   826	

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