Check file exists before unlinking in 'file_unlink'

inc/functions.php

@@ -795,12 +795,16 @@ function file_unlink($path) {
 		$debug['unlink'][] = $path;
 	}
 
-	$ret = @unlink($path);
+	if (file_exists($path)) {
+		$ret = @unlink($path);
 
-        if ($config['gzip_static']) {
-                $gzpath = "$path.gz";
+		    if ($config['gzip_static']) {
+		            $gzpath = "$path.gz";
 
-		@unlink($gzpath);
+			@unlink($gzpath);
+		}
+	} else {
+		$ret = false;
 	}
 
 	if (isset($config['purge']) && $path[0] != '/' && isset($_SERVER['HTTP_HOST'])) {