bug#21745: 25.0.50; emacs infloops after call to vc-annotate

[Eli Zaretskii]

> From: Ken Brown <kbrown@cornell.edu>
> Date: Fri, 23 Oct 2015 15:14:50 -0400
> 
> This bug does not occur in 'emacs -Q' or even 'emacs -q'.  But it does 
> occur if I start emacs with no .emacs, no .emacs.d, and no default.el. 
> To reproduce:
> 
> emacs
> C-x d ~/src/emacs/master  [This is my clone of the emacs repo.]
> v   [To view .dir-locals.el.]
> C-x v g
> 
> At this point the cursor is in the annotate buffer (but not blinking), 
> and emacs starts using a lot of CPU and is unresponsive.  I assume it is 
> inflooping.  If I send the emacs process a SIGUSR2, it is responsive 
> again.  At this point I can do 'C-x v g' again with no problem.

Thanks, I think I fixed this.