Specific configuration leads to memory violations

The following command:

```
./sphinx_fe -smoothspec yes -nfilt 10 -i 001.wav -o x
```

where ```001.wav``` is https://github.com/cmusphinx/pocketsphinx/blob/master/test/data/cards/001.wav

results in memory violations (out of bounds reads and writes)

If you acknowledge and fix this, could you please credit 'ForAllSecure Mayhem'?

Thanks