Fix codechecker issues so CI passes

auth.php

@@ -529,7 +529,6 @@ protected function get_mapping_parameter() {
                 ];
                 break;
 
-
             default:
                 $parameter = [];
                 break;

classes/privacy/provider.php

@@ -26,7 +26,6 @@
 namespace auth_userkey\privacy;
 
 use core_privacy\local\metadata\null_provider;
-use core_privacy\local\legacy_polyfill;
 
 /**
  * Privacy provider.
@@ -35,15 +34,13 @@
  * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  */
 class provider implements null_provider {
-    use legacy_polyfill;
-
     /**
      * Get the language string identifier with the component's language
      * file to explain why this plugin stores no data.
      *
      * @return  string
      */
-    public static function _get_reason() {
+    public static function get_reason(): string {
         return 'privacy:metadata';
     }
 }

tests/auth_plugin_test.php

@@ -896,7 +896,9 @@ public function test_that_user_gets_redirected_to_external_wantsurl(): void {
         $_POST['wantsurl'] = 'http://test.com/course/index.php?id=12&key=134';
 
         $this->expectException(moodle_exception::class);
-        $this->expectExceptionMessage('Unsupported redirect to http://test.com/course/index.php?id=12&key=134 detected, execution terminated');
+        $this->expectExceptionMessage(
+            'Unsupported redirect to http://test.com/course/index.php?id=12&key=134 detected, execution terminated'
+        );
 
         // Using @ is the only way to test this. Thanks moodle!
         @$this->auth->user_login_userkey();

tests/core_userkey_manager_test.php

@@ -64,8 +64,12 @@ public function setUp(): void {
      * @return void
      * @throws \dml_exception
      */
-    private function validate_iprestriction(string $allowips = '', string $script = 'auth/userkey', ?string $iprestriction = null,
-                                            int $keylifetime = 60): void {
+    private function validate_iprestriction(
+        string $allowips = '',
+        string $script = 'auth/userkey',
+        ?string $iprestriction = null,
+        int $keylifetime = 60
+    ): void {
         global $DB;
         $manager = new core_userkey_manager($this->config);
         if ($allowips) {