bug#31446: 26.1; sql-interactive-mode buffer naming is broken

[Eli Zaretskii]

> Date: Mon, 21 May 2018 10:17:08 +1200
> From: Phil Sainty <psainty@orcon.net.nz>
> Cc: fgunbin@fastmail.fm, 31446@debbugs.gnu.org
> 
> I'll need to test more thoroughly later, but I can tell you
> that the current code isn't working, as the (zerop new-name)
> condition produces code like (= 0 nil) or (= 0 '(4)) which
> results in, e.g., (wrong-type-argument number-or-marker-p (4))

Sorry, that was a stupid typo, now fixed.