Ticket 47592 - automember plugin task memory leaks

The search pblock was not destroyed at the end of the export and rebuild
tasks.

https://fedorahosted.org/389/ticket/47592

Reviewed by: richm(Thanks!)

ldap/servers/plugins/automember/automember.c

@@ -2223,7 +2223,6 @@ void automember_rebuild_task_thread(void *arg){
         }
     }
     automember_config_unlock();
-    slapi_free_search_results_internal(search_pb);
 
 out:
     if (plugin_is_betxn && fixup_pb) {
@@ -2234,6 +2233,8 @@ out:
         }
         slapi_pblock_destroy(fixup_pb);
     }
+    slapi_free_search_results_internal(search_pb);
+    slapi_pblock_destroy(search_pb);
 
     if(result){
         /* error */
@@ -2433,9 +2434,11 @@ void automember_export_task_thread(void *arg){
         }
     }
     automember_config_unlock();
-    slapi_free_search_results_internal(search_pb);
 
 out:
+    slapi_free_search_results_internal(search_pb);
+    slapi_pblock_destroy(search_pb);
+
     if(ldif_fd){
         PR_Close(ldif_fd);
     }