[tz] signed overflow

[Paul Eggert]

On 03/09/2015 09:08 AM, Richter, Jörg wrote:
> The last *= 2 will overflow a signed integer time_t. This can be fixed 
> with “lo = -1” instead of “lo = 1”.

Thanks for reporting that bug.  Attached is a proposed patch that should 
solve the problem in a simpler way.  (It also fixes some nearby white 
space problems.)  I've installed this in the experimental version on github.
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