Normalization of generic weak references (academic fix)

http://developer.apple.com/library/mac/#releasenotes/ObjectiveC/RN-TransitioningToARC/Introduction/Introduction.html

 You should decorate variables correctly. When using qualifiers in an
object variable declaration, the correct format is:

ClassName * qualifier variableName;

Other variants are technically incorrect but are “forgiven” by the
compiler. To understand the issue, see http://cdecl.org/.