[m-dev.] Bug fix in passes_aux.m\

[Tyson Richard DOWD]

> G'day.
> 
> This change has been committed.
> 
> There is no regression test; the bug was picked up by the new
> mode checker.

If there is a bug that triggers this, even if it won't trigger it until
you commit the new mode checker, can you keep that around - it's not
that important now, but any test cases you found while getting the mode
checker to work are probably worth keeping and committing once you
committ the new mode checker (or even before)..

-- 
       Tyson Dowd           # 
                            #  Surreal humour isn't eveyone's cup of
     trd at cs.mu.oz.au        #  fur.
http://www.cs.mu.oz.au/~trd #