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Check against zero in ternary code

All expressions must be evaluated before of taking
decisions based in then.

--- a/expr.c

+++ b/expr.c

@@ -637,9 +637,10 @@

 	while (accept('?')) {

 		ifyes = expr();

 		expect(':');

-		ifno = expr();

+		ifno = ternary();

 		/* TODO: check the types of ifno and ifyes */

-		cond = ternarycode(cond, ifyes, ifno);

+		cond = ternarycode(compare(ONE, cond, constcode(zero)),

+	                           ifyes, ifno);

 	}

 	return cond;

 }