[PATCH] getent: Use dynarray in initgroups_keys [BZ #18023]

[DJ Delorie]

fweimer@redhat.com (Florian Weimer) writes:
> 2018-06-25  Florian Weimer  <fweimer@redhat.com>
>
> 	[BZ #18023]
> 	* nss/getent.c (initgroups_keys): Use dynarray instead of
> 	extend_alloca.

LGTM.