[bug report] cpufreq: mediatek-hw: Add support for MT8196

[bug report] cpufreq: mediatek-hw: Add support for MT8196

[Dan Carpenter]

Hello Nicolas Frattaroli,

Commit 32e0d669f3ac ("cpufreq: mediatek-hw: Add support for MT8196")
from Jul 16, 2025 (linux-next), leads to the following Smatch static
checker warning:

	drivers/cpufreq/mediatek-cpufreq-hw.c:76 mtk_cpufreq_hw_mt8196_init()
	warn: passing zero to 'PTR_ERR'

drivers/cpufreq/mediatek-cpufreq-hw.c
    72 static int mtk_cpufreq_hw_mt8196_init(struct mtk_cpufreq_priv *priv)
    73 {
    74         priv->fdvfs = devm_of_iomap(priv->dev, priv->dev->of_node, 0, NULL);
    75         if (IS_ERR_OR_NULL(priv->fdvfs))
                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^
devm_of_iomap() can't return NULL.

--> 76                 return dev_err_probe(priv->dev, PTR_ERR(priv->fdvfs),

Passing a zero to to dev_err_probe() is a bug.  See my blog for more
details:
https://staticthinking.wordpress.com/2022/08/01/mixing-error-pointers-and-null/

    77                                      "failed to get fdvfs iomem\n");
    78 
    79         return 0;
    80 }

regards,
dan carpenter