Fixing another CCSpriteFrame cleanup bug
Fixing another CCSpriteFrame cleanup bug

* another constructor argument rect matched name of private ivar
* renaming arg to prevent local scoping issue

haithemaraissia/CocosSharp,netonjm/CocosSharp,MSylvia/CocosSharp,haithemaraissia/CocosSharp,MSylvia/CocosSharp,hig-ag/CocosSharp,zmaruo/CocosSharp,mono/CocosSharp,TukekeSoft/CocosSharp,zmaruo/CocosSharp,TukekeSoft/CocosSharp,netonjm/CocosSharp,hig-ag/CocosSharp,mono/CocosSharp