[AD] small fix in the test program

[Elias Pschernig <elias@xxxxxxxxxx>]

Going to apply this small fix, for a problem probably introduced when
set_gfx_mode was modified to clear allegro_error some time ago.

-- 
Elias Pschernig <elias@xxxxxxxxxx>

Index: test.c
===================================================================
RCS file: /cvsroot/alleg/allegro/tests/test.c,v
retrieving revision 1.28
diff -u -r1.28 test.c
--- test.c	29 Nov 2003 07:24:19 -0000	1.28
+++ test.c	4 Jan 2004 11:39:50 -0000
@@ -4272,6 +4272,8 @@
 	       }
 	    }
 	    else {
+	       char buf[ALLEGRO_ERROR_SIZE];
+	       ustrzcpy (buf, sizeof buf, allegro_error);
 	       set_color_depth(8);
 	       request_refresh_rate(0);
 	       if (set_gfx_mode(GFX_SAFE, 320, 200, 0, 0)!=0) {
@@ -4285,7 +4287,7 @@
 	       gui_mg_color = palette_color[8];
 	       gui_bg_color = palette_color[0];
 
-	       alert("Error setting mode:", allegro_error, NULL, "Sorry", NULL, 13, 0);
+	       alert("Error setting mode:", buf, NULL, "Sorry", NULL, 13, 0);
 	    }
 	 }
       }