bug#11813: Segmentation fault on launch related to x_draw_glyph_string_background

[Eli Zaretskii]

> Date: Fri, 29 Jun 2012 05:25:26 +0300
> From: Left Right <olegsivokon@gmail.com>
> 
> Program received signal SIGSEGV, Segmentation fault.
> x_draw_glyph_string_background (s=0x7fffffffcb60, force_p=1) at xterm.c:1210
> 1210          else if (FONT_HEIGHT (s->font) < s->height - 2 * box_line_width

Is the reason for SIGSEGV that s->font is a NULL pointer?  If not,
what is the reason?