[FREELDR] Initialize CandidatePageCount to zero, needed if the while-loop is not...

[FREELDR] Initialize CandidatePageCount to zero, needed if the while-loop is not run.

Granted, if the while-loop is not run, this means there is no memory
available at all on the computer where FreeLdr is running, which is
quite unexpected. But do the initialization anyways, in order to avoid
more obscure bugs down the line.

On the other hand, PageLookupTableMemAddress doesn't need to be
pre-initialized, since it gets initialized unconditionally afterwards.