Patch to avoid history duplicates applied

[Pavel Roskin]

Hello!

> And Alt-P in the command line doesn't work now :) It shows not the
> last command, but the previous one. Alt-H works fine. It has to be
> some simple mistake.

Yes, it was a simple mistake.  Even the comment "return pointer to last
entry in list" was preserved, but the code actually doing it disappeared
during conversion.

Fixed now.  Thank you!

-- 
Regards,
Pavel Roskin