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Wireshark-dev: Re: [Wireshark-dev] Fix signed overflow

From: Guy Harris <guy@xxxxxxxxxxxx>
Date: Thu, 11 Feb 2016 11:05:46 -0800
Not that the variables should be signed in any case:

	https://code.wireshark.org/review/13897

(and not that we're likely to have 2^31-1 or 2^32-1 files to merge, so this is unlikely to be an issue in practice).