Fix crash at startup under XASSERTS.

 src/xfaces.c (check_lface_attrs) [HAVE_WINDOW_SYSTEM]: Allow `nil'
 for attrs[LFACE_FONTSET_INDEX].

src/ChangeLog

+2011-07-24  Eli Zaretskii  <eliz@gnu.org>
+
+	* xfaces.c (check_lface_attrs) [HAVE_WINDOW_SYSTEM]: Allow `nil'
+	for attrs[LFACE_FONTSET_INDEX].
+
 2011-07-23  Paul Eggert  <eggert@cs.ucla.edu>
 
 	* xml.c (parse_region): Remove unused local

src/xfaces.c

@@ -1918,7 +1918,8 @@ check_lface_attrs (Lisp_Object *attrs)
 	   || IGNORE_DEFFACE_P (attrs[LFACE_FONT_INDEX])
 	   || FONTP (attrs[LFACE_FONT_INDEX]));
   xassert (UNSPECIFIEDP (attrs[LFACE_FONTSET_INDEX])
-	   || STRINGP (attrs[LFACE_FONTSET_INDEX]));
+	   || STRINGP (attrs[LFACE_FONTSET_INDEX])
+	   || NILP (attrs[LFACE_FONTSET_INDEX]));
 #endif
 }