MDL-18644 Both if and else end with return therefore another return afterwards is

obsolete. Also, "return true" at top of the function renders all the
following code useless

question/format/blackboard_6/format.php

@@ -40,6 +40,7 @@ class qformat_blackboard_6 extends qformat_default {
     function clean_temp_dir($dir='') {
         // for now we will just say everything happened okay note 
         // that a mess may be piling up in $CFG->dataroot/temp/bbquiz_import
+        // TODO return true at top of the function renders all the following code useless
         return true;
         
         if ($dir == '') {
@@ -184,7 +185,6 @@ class qformat_blackboard_6 extends qformat_default {
                             } else {
                                 return $filearray;
                             }
-                            return false;        
                         }
                     }
                     else {