[Bug libc/19038] argp.doc prints incorrectly when it starts with "\v"

["kstauffer at gmail dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=19038

--- Comment #1 from Kenny Stauffer <kstauffer at gmail dot com> ---
It looks like the error stems from the argp_doc function. This section:

1469      if (doc)
1470        {
1471          char *vt = strchr (doc, '\v');
1472          inp_text = post ? (vt ? vt + 1 : 0) : doc;
1473          inp_text_limit = (!post && vt) ? (vt - doc) : 0;
1474        }

When processing what should come before the '\v', this section sets inp_text =
doc and inp_text_limit = 0. That value of inp_text_limit is interpreted later
to mean "print the whole string."

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