Fix a failure of rpl_cross_version, caused by hand-initalization

of the TABLE_LIST instance, which did not initialize the 
MDL request properly.
Use init_one_table() to initialize the MDL request.

sql/log_event.cc

@@ -4583,10 +4583,10 @@ int Load_log_event::do_apply_event(NET* net, Relay_log_info const *rli,
     thd->warning_info->opt_clear_warning_info(thd->query_id);
 
     TABLE_LIST tables;
-    bzero((char*) &tables,sizeof(tables));
-    tables.db= thd->strmake(thd->db, thd->db_length);
-    tables.alias = tables.table_name = (char*) table_name;
-    tables.lock_type = TL_WRITE;
+    tables.init_one_table(thd->strmake(thd->db, thd->db_length),
+                          thd->db_length,
+                          table_name, strlen(table_name),
+                          table_name, TL_WRITE);
     tables.updating= 1;
 
     // the table will be opened in mysql_load