[PATCH] Fix ilogb exception and errno (bug 6794)

[David Miller]

From: "Carlos O'Donell" <carlos@systemhalted.org>
Date: Wed, 18 Apr 2012 00:45:13 -0400

> IMO, please feel free to revert this commit until someone fixes the
> issue.

I'll give the guilty party one day to rectify this.