CID: 982065: Wrapper object use after free.
I've move AutoPtr m and CiffComponent* cc into the object (instead of the stack) and m_ and cc_. 
This should ensure equal lifetime for m_ and cc_ and so the returned value of cc_ will be valid during recursion.

git-svn-id: svn://dev.exiv2.org/svn@3276 b7c8b350-86e7-0310-a4b4-de8f6a8f16a3