Warning fixes from Christos Zoulas

- shadowed variables
- signed/unsigned confusion
- const lossage
- incomplete structure initializations
- unused code

lib/krb5/mk_error.c

@@ -75,7 +75,8 @@ krb5_mk_error(krb5_context context,
 	msg.realm = server->realm;
 	msg.sname = server->name;
     }else{
-	msg.realm = "<unspecified realm>";
+	static char unspec[] = "<unspecified realm>";
+	msg.realm = unspec;
     }
     if(client){
 	msg.crealm = &client->realm;