[PATCH] Fix line-wrapping typo in comment

[Michael Forney]

On 2020-04-26, David Newall <openssh at davidnewall.com> wrote:
> As a matter of principle, I argue against accepting patches like this
> one.  It achieves nothing of merit, and it introduces noise when
> comparing different versions.

The merit is that it prevents confusion (or at least, a double-take)
for anyone reading this code for the remainder of its lifetime,
especially since the '*' character is often used as the multiplication
operator, and here it is adjacent to the word "negative", which
further increases this association.

Personally, I think this outweighs the one-time tiny bit of noise
between the two versions.