Entropy from uninitialized memory

There is a function that adds entropy to the pool. This function is called with secure random
values in some places, and called with uninitialized memory in other places. The Debian
developers commented out the line that actually mixes the buffer into the pool, rather than
making the function only get called with initialized values. This took care of the
uninitialized memory getting used, but also meant that the secure random numbers didn't get
used, either.