diff -r 3d4e9c994f10 -r a86126ab1dd4 wp/wp-includes/ms-files.php
--- a/wp/wp-includes/ms-files.php	Tue Oct 22 16:11:46 2019 +0200
+++ b/wp/wp-includes/ms-files.php	Tue Dec 15 13:49:49 2020 +0100
@@ -9,7 +9,7 @@
  */
 
 define( 'SHORTINIT', true );
-require_once( dirname( dirname( __FILE__ ) ) . '/wp-load.php' );
+require_once dirname( __DIR__ ) . '/wp-load.php';
 
 if ( ! is_multisite() ) {
 	die( 'Multisite support not enabled' );
@@ -19,7 +19,7 @@
 
 error_reporting( 0 );
 
-if ( $current_blog->archived == '1' || $current_blog->spam == '1' || $current_blog->deleted == '1' ) {
+if ( '1' == $current_blog->archived || '1' == $current_blog->spam || '1' == $current_blog->deleted ) {
 	status_header( 404 );
 	die( '404 — File not found.' );
 }
@@ -41,12 +41,12 @@
 	$mimetype = 'image/' . substr( $file, strrpos( $file, '.' ) + 1 );
 }
 
-header( 'Content-Type: ' . $mimetype ); // always send this
+header( 'Content-Type: ' . $mimetype ); // Always send this.
 if ( false === strpos( $_SERVER['SERVER_SOFTWARE'], 'Microsoft-IIS' ) ) {
 	header( 'Content-Length: ' . filesize( $file ) );
 }
 
-// Optional support for X-Sendfile and X-Accel-Redirect
+// Optional support for X-Sendfile and X-Accel-Redirect.
 if ( WPMU_ACCEL_REDIRECT ) {
 	header( 'X-Accel-Redirect: ' . str_replace( WP_CONTENT_DIR, '', $file ) );
 	exit;
@@ -61,7 +61,7 @@
 header( 'ETag: ' . $etag );
 header( 'Expires: ' . gmdate( 'D, d M Y H:i:s', time() + 100000000 ) . ' GMT' );
 
-// Support for Conditional GET - use stripslashes to avoid formatting.php dependency
+// Support for conditional GET - use stripslashes() to avoid formatting.php dependency.
 $client_etag = isset( $_SERVER['HTTP_IF_NONE_MATCH'] ) ? stripslashes( $_SERVER['HTTP_IF_NONE_MATCH'] ) : false;
 
 if ( ! isset( $_SERVER['HTTP_IF_MODIFIED_SINCE'] ) ) {
@@ -69,7 +69,7 @@
 }
 
 $client_last_modified = trim( $_SERVER['HTTP_IF_MODIFIED_SINCE'] );
-// If string is empty, return 0. If not, attempt to parse into a timestamp
+// If string is empty, return 0. If not, attempt to parse into a timestamp.
 $client_modified_timestamp = $client_last_modified ? strtotime( $client_last_modified ) : 0;
 
 // Make a timestamp for our most recent modification...
@@ -83,6 +83,6 @@
 	exit;
 }
 
-// If we made it this far, just serve the file
+// If we made it this far, just serve the file.
 readfile( $file );
 flush();