Remove an obsolete comment and an unused variable.

sql/sp_head.cc:
  Remove an obsolete comment (recursion in SP is disabled)
sql/sql_select.h:
  Remove an unused variable.

sql/sp_head.cc

@@ -1827,17 +1827,6 @@ sp_lex_keeper::reset_lex_and_exec_core(THD *thd, uint *nextp,
   thd->query_id= next_query_id();
   VOID(pthread_mutex_unlock(&LOCK_thread_count));
 
-  /*
-    FIXME. Resetting statement (and using it) is not reentrant, thus recursive
-           functions which try to use the same LEX twice will crash server.
-           We should prevent such situations by tracking if LEX is already
-           in use and throwing error about unallowed recursion if needed.
-           OTOH it is nice to allow recursion in cases when LEX is not really
-           used (e.g. in mathematical functions), so such tracking should be
-           implemented at the same time as ability not to store LEX for
-           instruction if it is not really used.
-  */
-
   if (thd->prelocked_mode == NON_PRELOCKED)
   {
     /*

sql/sql_select.h

@@ -230,7 +230,7 @@ class JOIN :public Sql_alloc
   /* Is set if we have a GROUP BY and we have ORDER BY on a constant. */
   bool          skip_sort_order;
 
-  bool need_tmp, hidden_group_fields, buffer_result;
+  bool need_tmp, hidden_group_fields;
   DYNAMIC_ARRAY keyuse;
   Item::cond_result cond_value;
   List<Item> all_fields; // to store all fields that used in query
@@ -299,8 +299,6 @@ class JOIN :public Sql_alloc
     skip_sort_order= 0;
     need_tmp= 0;
     hidden_group_fields= 0; /*safety*/
-    buffer_result= test(select_options & OPTION_BUFFER_RESULT) &&
-      !test(select_options & OPTION_FOUND_ROWS);
     error= 0;
     select= 0;
     return_tab= 0;