bug#24996: Bug in PR utility

[Paul Eggert]

Marcel Böhme wrote:
> There is an integer overflow in pr.c:1880 which results in memory exhaustion. 
> The bug was found with AFLFast, a fork of AFL.

Did it find only one such problem? I found half a dozen in the neighborhood. I 
guess it gave up after the first one. I fixed the bugs I found, by installing 
the attached patch. No doubt there are more bugs like this; please send more.

0001-pr-fix-integer-overflow-in-buffer-size-calcs.txt
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