widl: Fix warning about unused structure field in lexer.
diff --git a/tools/widl/parser.l b/tools/widl/parser.l
index 21faf7b..17c97b8 100644
--- a/tools/widl/parser.l
+++ b/tools/widl/parser.l
@@ -171,7 +171,6 @@
 static struct keyword {
 	const char *kw;
 	int token;
-	int val;
 } keywords[] = {
 	{"FALSE",			tFALSE},
 	{"TRUE",			tTRUE},