Avoid undefined shift overflow in dhclient

[alan somers]

Thanks for your submission.  While your reasoning seems correct, I'm still
baffled that neither Clang nor Coverity complains about it.  Fixed now.
-Alan

On Wed, Dec 13, 2017 at 1:35 PM, Michael McConville <mmcco at mykolab.com>
wrote:

> It seems like I should have sent this patch to this list rather than
> opening a
> ticket:
>
> https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=208007
>
> Thanks for your time,
> Michael McConville
> University of Utah
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