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Correct expression() in cc2

The maximum value of the input value is 7f and not 1f.

--- a/cc2/parser.c

+++ b/cc2/parser.c

@@ -411,7 +411,7 @@

 		error(ESYNTAX);

 	do {

-		if ((c = token[0]) > 0x1f || (fun = optbl[c]) == NULL)

+		if ((c = token[0]) > 0x7f || (fun = optbl[c]) == NULL)

 			error(ESYNTAX);

 		(*fun)(token);

 	} while (token = strtok(NULL, "\t"));