firmware: dmi-id: add a release callback function

From: Arnd Bergmann <[email protected]>

dmi_class uses kfree() as the .release function, but that now causes a warning with clang-16 as it violates control flow integrity (KCFI) rules:

drivers/firmware/dmi-id.c:174:17: error: cast from 'void (*)(const void *)' to 'void (*)(struct device *)' converts to incompatible function type [-Werror,-Wcast-function-type-strict]
174 | .dev_release = (void(*)(struct device *)) kfree,

Add an explicit function to call kfree() instead.

---
 drivers/firmware/dmi-id.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

index 5f3a3e913d28..d19c78a78ae3 100644
@@ -169,9 +169,14 @@ static int dmi_dev_uevent(const struct device *dev, struct kobj_uevent_env *env)
 	return 0;
 }
 
+static void dmi_dev_release(struct device *dev)
+{
+	kfree(dev);
+}
+
 static struct class dmi_class = {
 	.name = "dmi",
-	.dev_release = (void(*)(struct device *)) kfree,
+	.dev_release = dmi_dev_release,
 	.dev_uevent = dmi_dev_uevent,
 };
 

2.39.2