bug#24206: 25.1; Curly quotes generate invalid strings, leading to a segfault

[Paul Eggert]

Eli Zaretskii wrote:

> I preferred to install one of the 2 patches I posted yesterday.

Let's not cut the RC now, as unfortunately that patch fails spectacularly. (I 
didn't test it yesterday; I tested your other patch, which is obviously better.) 
To reproduce the problem, run emacs -Q and "C-h f car RET"; Emacs will display 
"Wrong type argument: integer-or-marker-p, nil" instead of help.

The attached patch to emacs-25 fixes the problem. It makes the code functionally 
equivalent to the other of the 2 patches that you posted yesterday, and is 
simpler. OK to install in emacs-25?

0001-Fix-wrong-type-argument-bug-with-C-h-f.patch
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