Coding Standards: Use strict comparison in `wp_xmlrpc_server::set_cus…

…tom_fields()`.

Follow-up to [40692].

Props aristath, poena, afercia, SergeyBiryukov.
See #62279.

git-svn-id: https://develop.svn.wordpress.org/trunk@59726 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/class-wp-xmlrpc-server.php

@@ -426,7 +426,7 @@ public function set_custom_fields( $post_id, $fields ) {
 				$meta['id'] = (int) $meta['id'];
 				$pmeta      = get_metadata_by_mid( 'post', $meta['id'] );
 
-				if ( ! $pmeta || $pmeta->post_id != $post_id ) {
+				if ( ! $pmeta || (int) $pmeta->post_id !== $post_id ) {
 					continue;
 				}