Although the code was accounting for this, the accounting was
insufficient; round off error meant that a declip operation with the
trigger set at 1.0 would not trigger properly on positive overrange.

While I was at it, I fixed the positive trigger offset to properly
correct for input word size and not blindly assume 16 bits/

Monty


git-svn-id: https://svn.xiph.org/trunk/postfish@5841 0101bb08-14d6-0310-b084-bc0e0c8e3800