The hack that was previously applied to CGBitmapContextCreateWithData() is now extended to another function, dispatch_data_create().
This function accepts a callback block, and the analyzer erroneously assumes that this callback may free up some data, which results in being unable to detect a leak of the dispatch_data_t object. In fact, the callback only frees the buffer that is passed into the function, but the returned object should be released separately unless in ARC mode.