bug#10035: Crash in check_x_frame in w32fns.c

[Eli Zaretskii]

> Date: Thu, 17 Nov 2011 21:17:47 -0700
> From: Christoph Scholtes <cschol2112@googlemail.com>
> CC: Juanma Barranquero <lekktu@gmail.com>, 10035@debbugs.gnu.org
> 
> I had two more `row_equal_p' crashes today when browsing C code.
> 
> This is with Mondays build r106380. I can provide backtraces tomorrow, 
> but I don't have a debug setup on this machine.

Please provide backtraces, and also how to reproduce, if you know
that.