```  zhack.c: In function \u2018zhack_fix_label_cksum\u2019:  zhack.c:485:2: error: missing braces around initializer [-Werror=missing-braces]    vdev_label_t labels[VDEV_LABELS] = {0};    ```    [CI build failure](http://build.zfsonlinux.org/builders/Debian%208%20ppc64%20%28BUILD%29/builds/42823)