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[cc2] Improve overflow check in cc2

--- a/cc2/symbol.c

+++ b/cc2/symbol.c

@@ -50,7 +50,7 @@

 	Symbol **htab, *sym;

 	static unsigned short num;

-	if (id > USHRT_MAX)

+	if (id >= USHRT_MAX)

 		error(EBADID);

 	htab = &symtab[id & NR_SYMHASH-1];