Fix:	SE015

Problem:
	X11 port bombs out with a Divide by zero/Floating point exception
	if no tile file is selected.

Compatible with:
	Slash'EM 0.0.5E4

Author: J. Ali Harlow, ali@avrc.city.ac.uk

Date:	22 Oct 1999

*** win/X11/winmap.c.orig	Fri Jul 30 14:19:45 1999
--- win/X11/winmap.c	Fri Oct 22 18:04:13 1999
***************
*** 255,264 ****
      Display *dpy = XtDisplay(toplevel);
      unsigned int width, height;
  
      height = tile_height * ((tile_count+tiles_per_line-1)/tiles_per_line);
      width  = tile_width * tiles_per_line;
- 
-     if (tile_image == 0) return;	/* no tiles */
  
      tile_pixmap = XCreatePixmap(dpy, XtWindow(toplevel),
  			width,
--- 255,264 ----
      Display *dpy = XtDisplay(toplevel);
      unsigned int width, height;
  
+     if (tile_image == 0) return;	/* no tiles */
+ 
      height = tile_height * ((tile_count+tiles_per_line-1)/tiles_per_line);
      width  = tile_width * tiles_per_line;
  
      tile_pixmap = XCreatePixmap(dpy, XtWindow(toplevel),
  			width,