bug#980: Bug? sit-for and obsolete syntax

[Christoph Conrad]

GNU Emacs 22.1.1 (i486-pc-linux-gnu, X toolkit, Xaw3d scroll bars) of
2008-05-03 on terranova, modified by Ubuntu

sit-for supports an obsolete call syntax with

(sit-for SECONDS &optional MILLISECONDS NODISP)

according to the doc string.

It checks:

  (when (or obsolete (numberp nodisp))
    (setq seconds (+ seconds (* 1e-3 nodisp)))
    (setq nodisp obsolete))

the first logical 'or' should be imho 'and'. Else obsolete could be
non-nil, but nodisp could be no number (e.g. nil), and that results in
an error when multiplying.