Resolve #3514289 "Fields check should"

ai_vdb_provider_postgres.module

@@ -19,7 +19,7 @@ function ai_vdb_provider_postgres_search_api_index_update(IndexInterface $index)
   if (!isset($backend_config['database'])) {
     return;
   }
-  if (!$backend_config['database'] == 'postgres') {
+  if ($backend_config['database'] !== 'postgres') {
     return;
   }
   $ai_vdb_provider_postgres = \Drupal::service('ai.vdb_provider')->createInstance('postgres');
@@ -44,4 +44,4 @@ function ai_vdb_provider_postgres_is_field_multiple($field) {
       return FALSE;
     }
     return TRUE;
-}
\ No newline at end of file
+}