Coding Standards: Use strict comparison in wp_xmlrpc_server::_insert_post().

Follow-up to [19848].

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

git-svn-id: https://develop.svn.wordpress.org/trunk@59707 602fd350-edb4-49c9-b593-d223f7449a82

Author: SergeyBiryukov

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

@@ -1488,7 +1488,7 @@ protected function _insert_post( $user, $content_struct ) {
 		}
 
 		$post_data['post_author'] = absint( $post_data['post_author'] );
-		if ( ! empty( $post_data['post_author'] ) && $post_data['post_author'] != $user->ID ) {
+		if ( ! empty( $post_data['post_author'] ) && $post_data['post_author'] !== $user->ID ) {
 			if ( ! current_user_can( $post_type->cap->edit_others_posts ) ) {
 				return new IXR_Error( 401, __( 'Sorry, you are not allowed to create posts as this user.' ) );
 			}