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anno: Stop segmentation violation on `-number 0'.
authorRalph Corderoy <ralph@inputplus.co.uk>
Tue, 1 Nov 2016 00:05:42 +0000 (00:05 +0000)
committerRalph Corderoy <ralph@inputplus.co.uk>
Tue, 1 Nov 2016 00:18:36 +0000 (00:18 +0000)
If atoi(3) returned zero, either because `0' was given or the number
could not be parsed, then the error message dereferenced an invalid
pointer.  Found when trying to increase coverage with check_exit.


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