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I think this leak may still exist in the FreeBSD port.

This is what OpenBSD's top(1) does when the libkvm call fails, and it's
a good idea.

This commit also fixes process name construction. The space was being
written one character too far.

Even when they're constant, as is the case for zombie processes.

Pointed out by Michael Reed.

So that we can see errno. Pointed out by Michael Reed.

I forgot how awful the process name logic was. It was an initial hack to
get it running, and I forgot to clean it up.

I also had to change a few includes and error function uses.

err.h functions corrupts the terminal when using curses.