checkpolicy: free identifiers on invalid typebounds

Free the two identifiers on an invalid typebounds in the error branch,
similar to the success branch.

Reported-by: oss-fuzz (issue 67700)
Signed-off-by: Christian Göttsche <cgzones@googlemail.com>
Acked-by: James Carter <jwcart2@gmail.com>

checkpolicy/policy_define.c

@@ -1477,8 +1477,12 @@ int define_typebounds(void)
 	}
 
 	while ((id = queue_remove(id_queue))) {
-		if (define_typebounds_helper(bounds, id))
+		if (define_typebounds_helper(bounds, id)) {
+			free(bounds);
+			free(id);
 			return -1;
+		}
+
 		free(id);
 	}
 	free(bounds);