zdtm/different_creds: return smth from main()

Reported-by: Mr. Travis
Signed-off-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

test/zdtm/live/static/different_creds.c

@@ -83,4 +83,5 @@ int main(int argc, char ** argv)
 	fail("shouldn't dump successfully");
 
 	exit_group(ret);
+	return 1;
 }