divide-by-zero during redisplay

[Miles Bader <miles.bader@necel.com>]

In the function "xfont_open", there's this code (line 611):

	  int width = font->space_width, n = pcm != NULL;

	  for (char2b.byte2 = 33; char2b.byte2 <= 126; char2b.byte2++)
	    if ((pcm = xfont_get_pcm (xfont, &char2b)) != NULL)
	      width += pcm->width, n++;
	  font->average_width = width / n;

I'm getting divide-by-zeros during redisplay, because n == 0.

Maybe this represents some degenerate condition (I'm having a hard time
reproducing it currently; I saw it happen while displaying rcirc channel
buffers), but still, it seems the code should avoid dividing by zero in
such a case.

Thanks,

-Miles

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religion.