fix return parameter, a=chris

diff --git a/lib/index_dictionary.php b/lib/index_dictionary.php
index 0fdbfdbe8..2f71d07f9 100644
--- a/lib/index_dictionary.php
+++ b/lib/index_dictionary.php
@@ -667,9 +667,9 @@ class IndexDictionary implements CrawlConstants
         }
         if(!isset($this->fhs[$file_num]) || $this->fhs[$file_num] === NULL) {
             $file_name = $this->dir_name. "/$file_num/".$this->max_tier."A.dic";
-            if(!file_exists($file_name)) return false;
+            if(!file_exists($file_name)) return $false;
             $this->fhs[$file_num] = fopen($file_name, "rb");
-            if($this->fhs[$file_num] === false) return false;
+            if($this->fhs[$file_num] === false) return $false;
             $this->file_lens[$file_num] = filesize($file_name);
         }
         if($bytes >= $this->file_lens[$file_num]) {