object->type = 0;
改为
object->type = RT_Object_Class_Null;
一个东西，但是提高源码可读性

[modify] if ... else if constructs to be terminated with an else clause, which other option is invalid and delete surplus space.

1. Improve code readability,  unify the variable name  in functions "rt_hw_interrupt_enable(level);" and "rt_hw_interrupt_enable(level);",
so changed variable  "temp" to "level";