Re: Fix up "git log --follow" a bit..

Linus Torvalds [off-list ref] writes:

As to "diff_queued_diff", I think it would be better off not as a global 
at all, but as being just an entry in the "struct diff_options" structure, 
but that's a separate issue, and there may be some subtle reason for why 
it's currently a global.

There is no subtle issue that I know of, but I have to double
check.  It is just that the code is one of the most ancient part
of the system by now.