[PATCH] nss_files: Use struct scratch_buffer instead of extend_alloca [BZ #18023]

[DJ Delorie]

fweimer@redhat.com (Florian Weimer) writes:
> 2018-06-25  Florian Weimer  <fweimer@redhat.com>
>
> 	[BZ #18023]
> 	* nss/nss_files/files-initgroups.c (_nss_files_initgroups_dyn):
> 	Use struct scratch_buffer instead of extend_alloca.

LGTM.