voutf: fix bad arethmetic when outputting warnings to stderr
CVE-2018-16842 Reported-by: Brian Carpenter Bug: https://curl.haxx.se/docs/CVE-2018-16842.html
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CVE-2018-16842 Reported-by: Brian Carpenter Bug: https://curl.haxx.se/docs/CVE-2018-16842.html