platform/x86: think-lmi: Fix check for admin password being set

tlmi_priv.pwd_admin->password is an array (not a pointer), so the correct
way to check for the password being set is to check for
tlmi_priv.pwd_admin->password[0] != 0.

For the second check, replace the check with checking that auth_str is
set instead.

Cc: Mark Pearson <markpearson@lenovo.com>
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Reported-by: coverity-bot <keescook+coverity-bot@chromium.org>
Addresses-Coverity-ID: 1505158 ("NO_EFFECT")
Fixes: a7314b3b1d8a ("platform/x86: think-lmi: Add WMI interface support on Lenovo platforms")
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Link: https://lore.kernel.org/r/20210609151752.156902-1-hdegoede@redhat.com

drivers/platform/x86/think-lmi.c

@@ -537,7 +537,7 @@ static ssize_t current_value_store(struct kobject *kobj,
 	p = strchrnul(new_setting, '\n');
 	*p = '\0';
 
-	if (tlmi_priv.pwd_admin->valid && tlmi_priv.pwd_admin->password) {
+	if (tlmi_priv.pwd_admin->valid && tlmi_priv.pwd_admin->password[0]) {
 		auth_str = kasprintf(GFP_KERNEL, "%s,%s,%s;",
 				tlmi_priv.pwd_admin->password,
 				encoding_options[tlmi_priv.pwd_admin->encoding],
@@ -563,7 +563,7 @@ static ssize_t current_value_store(struct kobject *kobj,
 	if (ret)
 		goto out;
 
-	if (tlmi_priv.pwd_admin->valid && tlmi_priv.pwd_admin->password)
+	if (auth_str)
 		ret = tlmi_save_bios_settings(auth_str);
 	else
 		ret = tlmi_save_bios_settings("");