Narrow return type for get_current_blog_id (#275)

Author: IanDelMar

functionMap.php

@@ -219,4 +219,5 @@
     'wp_nonce_url' => [null, 'action' => '-1|string'],
     'wp_nonce_field' => [null, 'action' => '-1|string'],
     'did_action' => ['int<0, max>'],
+    'get_current_blog_id' => ['int<0, max>'],
 ];

wordpress-stubs.php

@@ -121165,6 +121165,7 @@ function absint($maybeint)
      * @global int $blog_id
      *
      * @return int Site ID.
+     * @phpstan-return int<0, max>
      */
     function get_current_blog_id()
     {