[theora-dev] _ilog() method

[Cesar Oliveira]

While digging into the code and reading the spec, I noticed that _ilog
doesn't properly return 0 when a negative number is passed because it
only accepts unsigned integers. An unsigned -1 (0xFFFFFF) would return
the number of bits in an int, rather than 0.

And it's an easy fix (and hopefully I am correct), so I'm sending it in. :)
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