* data/yacc.c (yyparse): Wrap the final return from yyparse inside YYID

to make sure that YYID will never be unused.  This fixes a 'make
maintainer-check' failure caused by the recent changes to the 'Trivial
grammars' test case, which caused g++ 4.1.0 to complain that YYID was
not used.
* data/glr.c (yyparse): Wrap yyparse's return inside YYID just in case.

data/glr.c

@@ -2523,7 +2523,8 @@ b4_syncline([@oline@], [@ofile@])])dnl
       yyfreeGLRStack (&yystack);
     }
 
-  return yyresult;
+  /* Make sure YYID is used.  */
+  return YYID (yyresult);
 }
 
 /* DEBUGGING ONLY */