Double free in client.c when SetupDiGetDeviceInterfaceDetail fails

```
In OpenDeviceInterface function, client.c:512 when 
SetupDiGetDeviceInterfaceDetail fails the current logic would free 
deviceInterfaceDetailData, then jump to cleanup where there would be an attempt 
to free it again.

The first free() in line 512 should be removed.
```

Original issue reported on code.google.com by `mlukas...@gmail.com` on 28 Apr 2014 at 2:46
