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Convert expressions of ternary operator

In a ternary operator the two result expressions must be of the
same type, or in other case they must be converted to the same type.

--- a/expr.c

+++ b/expr.c

@@ -691,7 +691,7 @@

 static Node *

 ternary(void)

 {

-	register Node *cond, *ifyes, *ifno;

+	Node *cond, *ifyes, *ifno;

 	cond = or();

 	while (accept('?')) {

@@ -698,7 +698,7 @@

 		ifyes = promote(expr());

 		expect(':');

 		ifno = promote(ternary());

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

+		typeconv(&ifyes, &ifno);

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

 	                           ifyes, ifno);

 	}