cvReleaseBlobs (EXC_BAD_ACCESS)

```
What steps will reproduce the problem?
1.   cvb::CvBlobs blobs;
2.   cvb::cvLabel(grey, labelImg, blobs);

Error: in cvReleaseBlobs (EXC_BAD_ACCESS)

Tested on:

OS X 10.7.5
Xcode 4.5.2
LLVM 4.1

with LLVM GCC 4.2 works fine
```

Original issue reported on code.google.com by `leonardo...@gmail.com` on 19 Jan 2013 at 3:38
