AFNetworking/AFNetworking — pull request #452 by mattt (2012-08-11 18:31:58+00:00)
Title: don't use __weak for completionBlocks. (Issue #414)

We nil out the completionBlock manually in AFURLConnectionOperation. Using __weak here potentially doesn't call the set completion blocks.
Restores iOS4 compatibility. Also shortens inline ifs with a ternary conditional(?:).