platform/x86: think-lmi: Remove unnecessary casts for attributes

These casts are unnecessary and could break if structure layouts are
randomized or implementation details change.
Use the proper syntax that works without casts.

Also remove some unnecessary braces that checkpatch complains about.
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Link: https://lore.kernel.org/r/20230329-think-lmi-attrs-v1-1-5794f2367cc2@weissschuh.netReviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>

drivers/platform/x86/think-lmi.c

@@ -862,19 +862,18 @@ static umode_t auth_attr_is_visible(struct kobject *kobj,
 	struct tlmi_pwd_setting *setting = to_tlmi_pwd_setting(kobj);
 
 	/* We only want to display level and index settings on HDD/NVMe */
-	if ((attr == (struct attribute *)&auth_index) ||
-			(attr == (struct attribute *)&auth_level)) {
+	if (attr == &auth_index.attr || attr == &auth_level.attr) {
 		if ((setting == tlmi_priv.pwd_hdd) || (setting == tlmi_priv.pwd_nvme))
 			return attr->mode;
 		return 0;
 	}
 
 	/* We only display certificates on Admin account, if supported */
-	if ((attr == (struct attribute *)&auth_certificate) ||
-			(attr == (struct attribute *)&auth_signature) ||
-			(attr == (struct attribute *)&auth_save_signature) ||
-			(attr == (struct attribute *)&auth_cert_thumb) ||
-			(attr == (struct attribute *)&auth_cert_to_password)) {
+	if (attr == &auth_certificate.attr ||
+	    attr == &auth_signature.attr ||
+	    attr == &auth_save_signature.attr ||
+	    attr == &auth_cert_thumb.attr ||
+	    attr == &auth_cert_to_password.attr) {
 		if ((setting == tlmi_priv.pwd_admin) && tlmi_priv.certificate_support)
 			return attr->mode;
 		return 0;