Fixed wrong merge

Optimize new pushed code

sql/item_func.cc

@@ -1378,7 +1378,6 @@ my_decimal *Item_func_abs::decimal_op(my_decimal *decimal_value)
 void Item_func_abs::fix_length_and_dec()
 {
   Item_func_num1::fix_length_and_dec();
-  maybe_null= 1;
 }
 
 

sql/sql_update.cc

@@ -121,7 +121,7 @@ int mysql_update(THD *thd,
   bool		safe_update= thd->options & OPTION_SAFE_UPDATES;
   bool		used_key_is_modified, transactional_table;
   int           res;
-  int		error=0;
+  int		error;
   uint		used_index= MAX_KEY;
   bool          need_sort= TRUE;
 #ifndef NO_EMBEDDED_ACCESS_CHECKS
@@ -132,7 +132,7 @@ int mysql_update(THD *thd,
   ha_rows	updated, found;
   key_map	old_used_keys;
   TABLE		*table;
-  SQL_SELECT	*select= 0;
+  SQL_SELECT	*select;
   READ_RECORD	info;
   SELECT_LEX    *select_lex= &thd->lex->select_lex;
   bool need_reopen;
@@ -237,7 +237,6 @@ int mysql_update(THD *thd,
   }
   // Don't count on usage of 'only index' when calculating which key to use
   table->used_keys.clear_all();
-  if (limit)
   select= make_select(table, 0, 0, conds, 0, &error);
   if (error || !limit ||
       (select && select->check_quick(thd, safe_update, limit)))