bug#10743: 24.0.93; missing type checking for Vtool_bar_button_margin in x_draw_image_relief

[Chong Yidong]

YAMAMOTO Mitsuharu <mituharu@math.s.chiba-u.ac.jp> writes:

> The current code in x_draw_image_relief (in xterm.c) applies XINT to
> Vtool_bar_button_margin without INTEGERP:
>
>   2326          extra = s->face->id == TOOL_BAR_FACE_ID
>   2327            ? XINT (Vtool_bar_button_margin) : 0;
>
> Other than an integer, a cons of integers is also a valid value for
> Vtool_bar_button_margin.

Thanks.  Fixed in trunk.